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 2010 wr250x engine blown at 7000 km

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soupbowl

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PostSubject: 2010 wr250x engine blown at 7000 km   Mon Jul 20, 2015 12:10 pm

Not sure if this is the right place to talk about this.

I bought my 2010 new and used it stock for 1.5 years, then I modded it with:

Yoshimura RS4
FMF Programmer
Flapper Screwed Down
AIS Removed
13/48 sprockets

I used it a full season without issue, 2 oil changes in that time and they were very clean, bike was running great.
I got run off the road earlier this season, caused damage to the bike but nothing to the engine. Got the bike fixed and checked out
and it ran great.

A month later the engine sounded a little off, it had a slightly higher pitch sound in the top end, that used to be a bassy sound.
I checked out oil and spark plug and it was running a little rich, so i dumped oil and tuned down my FMF programmer.
The sound went away and bike was running good, 2 weeks later I heard the sound again so I checked oil. This time it was loaded with gas
so I dumped it, did another service and pulled out the programmer. removing the programmer the bike was running shockingly well. It made me reconsider
even using one.

Today I took it to work and it was running like a bat out of hell, had so much power felt great. 5 minutes later at 100 km/hr merging onto the highway
the engine bogged down and started grinding gears. I pulled over to find this:



Nice big crack in my engine casing, no oil in engine and I can't shift beyond 2nd. There is no warranty on the bike and I still own money on it,
not sure what to even do at this point.
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Caldsy

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Mon Jul 20, 2015 12:52 pm

sorry to hear :(

What NOT to do: Stop making the payments with the bank... otherwise you won't get financing for a toaster when you need it.

What TO do: Continue making the payments (even if it hurts) and try to save up some $ to fix it.
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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Mon Jul 20, 2015 5:36 pm

Yeah I plan to keep paying for the bike, thanks. I plan to try and get some help from Yamaha warranty, They have to stand by their engines enough to gurantee over 7000 kms.
I pulled the engine apart and found what had happen, any input from people that have tried to get warranty for something similar would be great.

My balancer shaft as seen on page 5-61 here: http://jaidnet.com/forsale/WR250R_SERVICEMANUAL.pdf
had 1-1.5 inches of play in all directions, the bearing on one side was fine, though the shaft was burnt and chewed up. There was no bearing on the other side,
their was just a metal collar that I assume a bearing was attached to, It grinded the hell out of the inner casing and the play from it, caused the balancer sprokect to eat up
the outter casing, I am not sure what cased the crack right through the outter casing though.

some pictures
Sprocket on the balancer shaft:

inner cassing, you can see 2 deep groves where the collar on the balancer shaft had grinded things up:

And here is the balancer shaft:




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wwguy

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Mon Jul 20, 2015 6:25 pm

Sorry to see this happen to you. Are you sure this is the extent of the damage? Reading your original post I can't help but suspect that the destroyed bearing and damaged balancer shaft resulted from excessive heat, lack of lubrication, and metal-to-metal wear as a result of the gasoline in your engine oil.

You might want to pull the top end apart and inspect it too. Running the engine lean causes heat which also affects spark plug operation and can lead to post-spark detonation. Detonation is notorious for generating high pitch high frequency noise in the cylinder, which sounds like what you described earlier. If left uncorrected long enough detonation can cause damage to spark plug and/or damage and ultimate failure of piston ring lands etc. If the latter occurred this might explain how fuel made it's way into the oil previously. You may have corrected the cause of the problem with new plug and programmer mods, but the initial mechanical damage may have already been done. Of course I'm just speculating based on the info you've shared so far.

Regardless, your history of mods to airflow and EFI fuel programming, plus your later tweaks and adjustments to those mods after you encountered problems, make it pretty difficult to point fingers at Yamaha and demand warranty repair with a straight face. It's unlikely, or at least much less likely, that you would have encountered this problem running with the stock setup.

Thanks for sharing your experience. It further encourages me not to mess with my own bike's stock fuel and air settings. I hope you get it all worked out and get your bike running again soon!

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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Mon Jul 20, 2015 7:26 pm

I had my mods on more then long enough and 2 solid oil changes in that time and engine was running clean and great.
The amount of gas in the oil was not a large amount, its just always concerning. I believe the sound I was hearing was actually that balancer shaft
carving out my case. It did not sound like metal on metal, but oil was coming through the hole where the shaft was cutting up the case. It might have
lubed it up enough that did not sound as bad as it should have.

I can't say my mods did not have an impact on this, but if they did, everyone with similar mods that made it over 50k km should be worried.
What I can say is, Its clear the balancer shaft bearing failed and things went to hell. The only bearing intact for the balancer shaft is in great condition
has no sign of heat damage and moves freely. I find it odd that a little bit of gas in the oil for a short amount of time would only cause
one bearing to gernade.

I will say wwguy, I would not mod my bike if i went back in time. But I don't feel the mods are what caused this problem, I could be wrong also.


edit: The bike is over my budget to repair in its current state, without looking at the top end. I will check the top end late rin the summer
just for fun. But this bike is a total write off for me as it is.
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beer goggle

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Tue Jul 21, 2015 2:02 am

Crikey that awful, feel sorry for ya bud. Hope you get it sorted, be it fixed or otherwise thumb

I've not read about this before, and peeps have been modding their WR's since day one. I too have all the usual mods and am now slightly concerned. scratch
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morgan9283




PostSubject: Re: 2010 wr250x engine blown at 7000 km   Tue Jul 21, 2015 12:48 pm

soupbowl wrote:


edit: The bike is over my budget to repair in its current state, without looking at the top end. I will check the top end late rin the summer
just for fun. But this bike is a total write off for me as it is.

Parting it out is  an option.  

Have you priced a used motor? I'm not an expert but from the extent of the damage I imagine a clean used motor would be cheaper and more reliable than repairing yours.

-morgan
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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Tue Jul 21, 2015 9:12 pm

[quote="morgan9283"]
soupbowl wrote:

Parting it out is  an option.  

Have you priced a used motor?  I'm not an expert but from the extent of the damage I imagine a clean used motor would be cheaper and more reliable than repairing yours.

-morgan

I have not priced out a motor, but I agree that it would be the better option. Later this week I am talking with the dealer I bought
the bike from to see about warranty. If/when that does not work out I am really leaning towards parting it out to pay it off.
I already have offers on some of the parts.
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Corycy




PostSubject: Re: 2010 wr250x engine blown at 7000 km   Tue Jul 21, 2015 11:56 pm

http://wr250rforum.forumotion.com/t7401-could-a-bearing-be-going-bad-in-my-motor

Here is my story from a few years ago.

I have similar mods as you and Yamaha covered it.... twice.

The original owner Greer had a bearing go, then I had the same bearing go again.

Here is her story. http://wr250rforum.forumotion.com/t5815-crankshaft-counterbalancer-bearing

The bike had the 5 year warranty on it. Yamaha wasn't crazy about the idea of new motor internals again, but they did it.

I never had gas in the oil leading up to the damage.

I'll be hitting 50K on the bike this week.

If you still owe a lot on the bike I would look for a new engine. If you only owe 1k, I would part it out.

What oil were you using?
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rsteiger

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Wed Jul 22, 2015 11:41 am

soupbowl wrote:
Yeah I plan to keep paying for the bike, thanks. I plan to try and get some help from Yamaha warranty, They have to stand by their engines enough to gurantee over 7000 kms.
I pulled the engine apart and found what had happen, any input from people that have tried to get warranty for something similar would be great.

My balancer shaft as seen on page 5-61 here: http://jaidnet.com/forsale/WR250R_SERVICEMANUAL.pdf
had 1-1.5 inches of play in all directions, the bearing on one side was fine, though the shaft was burnt and chewed up. There was no bearing on the other side,
their was just a metal collar that I assume a bearing was attached to, It grinded the hell out of the inner casing and the play from it, caused the balancer sprokect to eat up
the outter casing, I am not sure what cased the crack right through the outter casing though.

some pictures
Sprocket on the balancer shaft:

inner cassing, you can see 2 deep groves where the collar on the balancer shaft had grinded things up:

Well based on your pictures there was enough play in the balancer shaft to cause the gears to jump and lose timing.  See those two dots (one on each gear) in the first picture?  Those should line up with one another when everything is in time.

The next picture looks like the engine case was hammered by the balancer shaft which is likely what cracked the case.

I doubt very much that you were running the engine lean with the programmer. If anything, based on my dyno experience, you may have been running a bit rich.

I did all those performance mods on my WRR too right after bought it new. There was definitely a power gain in the motor on the top end and some in the mid range but i always felt like I lost some torque down low. After having some no start issues I decided to put everything back to stock.

I did lose some power on the top end but picked up a little bit more response on the low end and for the type of riding I do that is a trade off I am good with.

But two other things changed on the bike after I put it back to stock.

First I was losing a oil and maybe would have to add about a half a quart between oil changes but now the oil level is steady with no consumption. Not sure why that would be but I will keep monitoring it.

Second is that my no start concern is gone, or at least hasn't shown up since I went back to stock.

I think I would look at a used motor or maybe parting out the bike. The issue with a used motor is you are never quite sure of what you are getting and I would be apt to go through a used motor and rebuild it before I installed it. At the very least I would disassemble it and check it out thoroughly before installing it.

You may be able to generate some funds by parting out your old motor as well.
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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Wed Jul 22, 2015 9:36 pm

Thanks a lot for the info Corycy & rsteiger, I found it very useful.

I talked to Yamaha in person today. They told me about 10 times that 'Those bikes never blow up.' no way they would warranty it and that you can't buy factory motors for them.
Also It would cost me over 5000 minimum to fix, you an imagine my blood pressure went sky high. The warranty guy looked through my file
and it said i had the full yamaha protect plan, which I never paid for. I have no papaerwork for it either, but with that they said they would
build a new engine from parts in the shop for free.

So I plan to retun bike to stock, sell my parts and then sell the bike once its finished. Without a new engine I will second guess every sound I hear.
But I am glad that this will end happily ish. If I have any warranty issues once the bike gets to the shop, I'll make sure to post updates.
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Evol

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Wed Jul 22, 2015 10:19 pm

That's cool that they're taking care of you !!!!  thumb
You've got a good dealership there!
And they are right, these motors "never" blow up (obviously yours did). Owners have been abusing the f@#k out of them for years (myself included) and they just keep coming back for more.
Good luck going forward...
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motokid
Moderator
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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 6:25 am

soupbowl wrote:

I can't say my mods did not have an impact on this, but if they did, everyone with similar mods that made it over 50k km should be worried.

I will say wwguy, I would not mod my bike if i went back in time. But I don't feel the mods are what caused this problem, I could be wrong also.

beer goggle wrote:

I've not read about this before, and peeps have been modding their WR's since day one. I too have all the usual mods and am now slightly concerned. scratch

Sometimes bad shit happens to good people. Sorry to see this, but there's no f'n way adding a pipe and a programmer and doing the flapper/AIS crap had anything to do with this.

I'd be far more inclined to think the accident you had prior to any of your mods was more the culprit, possible it just took time for it to wear down something inside the motor.

But it could just be bad luck.

Very few owners of X's or R's keep the stock exhaust and almost everyone adds a fuel programmer.
Many of these bikes have been ridden real damn hard for many many years and this is the first time I've seen anything like this posted here.

Almost every damn motorcycle sold to any American ever has had the exhaust changed and some little power tweak added to get more power. Extremely run-of-the-mill mods like that don't cause motors to fall apart.

Something else happen, and that sucks big furry balls to be sure, but it wasn't the pipe and programmer.

_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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motokid
Moderator
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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 6:34 am

soupbowl wrote:

I got run off the road earlier this season, caused damage to the bike but nothing to the engine.

Describe the "accident" in more detail please.

What was damage to bike?

Your issues with gas in oil started after this accident.

And the gas in oil problem appears to have gotten worse over time (after the accident) according to your post.

Your posts also allude to the fact the prior to the accident, you did not have gas in oil issues for the entire time you owned the bike. Years in fact.

Right?

_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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michiko




PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 9:16 am

motokid wrote:
soupbowl wrote:

I can't say my mods did not have an impact on this, but if they did, everyone with similar mods that made it over 50k km should be worried.

I will say wwguy, I would not mod my bike if i went back in time. But I don't feel the mods are what caused this problem, I could be wrong also.

beer goggle wrote:

I've not read about this before, and peeps have been modding their WR's since day one. I too have all the usual mods and am now slightly concerned. scratch

Sometimes bad shit happens to good people. Sorry to see this, but there's no f'n way adding a pipe and a programmer and doing the flapper/AIS crap had anything to do with this.

I'd be far more inclined to think the accident you had prior to any of your mods was more the culprit, possible it just took time for it to wear down something inside the motor.

But it could just be bad luck.

Very few owners of X's or R's keep the stock exhaust and almost everyone adds a fuel programmer.
Many of these bikes have been ridden real damn hard for many many years and this is the first time I've seen anything like this posted here.

Almost every damn motorcycle sold to any American ever has had the exhaust changed and some little power tweak added to get more power. Extremely run-of-the-mill mods like that don't cause motors to fall apart.

Something else happen, and that sucks big furry balls to be sure, but it wasn't the pipe and programmer.

glad you feel that way. i just purchased a progammer. i had a tenere before this. and some unlucky owners were the random subjects to unfortunate bearing failure that could only be put down to misfortune. faulty bearings were also the cause.
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rsteiger

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 10:04 am

motokid wrote:
soupbowl wrote:

I can't say my mods did not have an impact on this, but if they did, everyone with similar mods that made it over 50k km should be worried.

I will say wwguy, I would not mod my bike if i went back in time. But I don't feel the mods are what caused this problem, I could be wrong also.

beer goggle wrote:

I've not read about this before, and peeps have been modding their WR's since day one. I too have all the usual mods and am now slightly concerned. scratch

Sometimes bad shit happens to good people. Sorry to see this, but there's no f'n way adding a pipe and a programmer and doing the flapper/AIS crap had anything to do with this.

I'd be far more inclined to think the accident you had prior to any of your mods was more the culprit, possible it just took time for it to wear down something inside the motor.

But it could just be bad luck.

Very few owners of X's or R's keep the stock exhaust and almost everyone adds a fuel programmer.
Many of these bikes have been ridden real damn hard for many many years and this is the first time I've seen anything like this posted here.

Almost every damn motorcycle sold to any American ever has had the exhaust changed and some little power tweak added to get more power. Extremely run-of-the-mill mods like that don't cause motors to fall apart.

Something else happen, and that sucks big furry balls to be sure, but it wasn't the pipe and programmer.

Actually this is the second WRR I know of were it appears that a counterbalance shaft bearing failure took out the motor.

First one was owned by a buddy of mine who bought it and thought it was running rough for other reasons. After doing some basic maintenance and not seeing any improvement he decided to sell the bike. He pointed out to the new owner that the motor was much rougher than a typical WRR and the guy rode it for about 6 months and then everything let go.
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motokid
Moderator
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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 2:03 pm

rsteiger wrote:


Actually this is the second WRR I know of were it appears that a counterbalance shaft bearing failure took out the motor.
 

Yes - but would simply doing the most basic of mods that the vast majority of us have done have caused that issue?

I'd find it hard to believe.

I really don't know anyone who hasn't lightly modded their motorcycle's exhaust and intake from stock. That includes Harleys, sport bikes, goldwings, dirt bikes, standards, and especially motards.

The OP didn't put on a turbo kit, or a big bore kit or something like that.

The OP did say there was an issue with gas in his oil after the bike was involved in an accident.

I just don't think people should start second guessing their choice to lightly mod their X or R based on this one incident.




_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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rsteiger

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 2:15 pm

motokid wrote:
rsteiger wrote:


Actually this is the second WRR I know of were it appears that a counterbalance shaft bearing failure took out the motor.
 

Yes - but would simply doing the most basic of mods that the vast majority of us have done have caused that issue?

I'd find it hard to believe.

I really don't know anyone who hasn't lightly modded their motorcycle's exhaust and intake from stock. That includes Harleys, sport bikes, goldwings, dirt bikes, standards, and especially motards.

The OP didn't put on a turbo kit, or a big bore kit or something like that.

The OP did say there was an issue with gas in his oil after the bike was involved in an accident.

I just don't think people should start second guessing their choice to lightly mod their X or R based on this one incident.

You are exactly right. This does not have anything to do with the mods on his bike. I think it has more to do with a bad bearing/sleeve from the time of manufacture or a defect in the material that caused the failure. It does not appear to be many of these out there but....

If you begin to notice a change in vibration on your WRR it is probably a good idea to have a look in this area instead of writing it off to some mod issue especially if it appears out of nowhere sometime after the mod was in place.
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wwguy

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 4:55 pm

I'm the guy that originally suggested that maybe the mods might have played a role in this failure, and I now retract that opinion in light of the updated information supplied.  

I made my earlier speculation based on the original statements referencing lean fuel mixture (which makes the motor run hotter), fuel in the oil, and high-pitched noise in the top end of the motor.   I believe all are possible symptoms of the ignition firing and timing issues I described (detonation and/or pre-ignition.)  But I didn't mean to suggest that all aftermarket air and fuel mods are all bad... just that they introduce risk of engine damage and premature failure if not properly implemented and/or tuned.

The sky is not falling.
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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu Jul 23, 2015 11:15 pm

motokid wrote:
soupbowl wrote:

I got run off the road earlier this season, caused damage to the bike but nothing to the engine.

Describe the "accident" in more detail please.

What was damage to bike?

Your issues with gas in oil started after this accident.

And the gas in oil problem appears to have gotten worse over time (after the accident) according to your post.

Your posts also allude to the fact the prior to the accident, you did not have gas in oil issues for the entire time you owned the bike. Years in fact.

Right?

It was a low KM/h crash; bars, damage to rear brake pedal, rear end and me. If that crash wrecked the engine, the engine is crap.
I have done as much damage and more to enduros and had them last more then 7k. That being said, you are correct, I had no
gas in oil issues before crash. I feel that my crash was minor enough that IF it did infact cause the bearing to fail, the bearing was
faulty to begin with.

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Corycy




PostSubject: Re: 2010 wr250x engine blown at 7000 km   Fri Jul 24, 2015 12:39 am

My bike became very loud before the failure, like someone was adding one marble per day in my motor.

When dealing with Yamaha, they were not crazy about warranting my bike but they did fully. Yamaha does not give full motors no matter if it is a warranty or for purchase.

My case was fine, so they replaced everything on the inside. If I remember right the parts total was near 5k, sucks for yamaha as this was the second time they had to do this for this bike.

Worst part was dealing with the shop. I was in Great Falls, MT. They tried to tell me Yamaha was only going to cover the cost of the parts and not the labor. I would have believed the shop until he said " so just pay what you can for the labor", he never gave me a total for the labor. I still had to get home to TN after the two month delay. I gave them a $20 I think. The guy probably just put in in his pocket.

You probably got turn down because your case cracked opened, they may think you wrecked it.

At least your shop is helping you out.
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motokid
Moderator
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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Fri Jul 24, 2015 6:30 am

soupbowl wrote:

and pulled out the programmer. removing the programmer the bike was running shockingly well.

Now keep in mind, I'm only commenting on your repeated comments about how you don't think your mods had anything to do with this engine failure, but then you immediately turn around and question/allude to the fact that they might have.

I understand that you had gas in oil prior to removing programmer. I understand that it was getting worse rather quickly.

The reason your bike ran better without it was simple. You went leaner.
Probably too lean. Leaner is meaner is the old saying.

Very few people recommend or feel safe modding the exhaust and air intake while doing nothing to add to the fuel side of the equation. The general theory is Yamaha tunes bikes somewhat lean for emissions/pollution reasons.

I highly doubt your little FmF programmer could force so much fuel into your bike that it'd blow past your piston rings.
Long before that you'd have flames and back-fires coming out your pipe end every time you down shifted. You'd also smell very strongly of gas every time you rode the bike.

Gas in oil is usually a sign of bad rings on pistons which could be due to many different things. It does sound like you were starting to experience a loss of compression and it took making the bike run leaner and leaner for it to feel right.

It's possible you went far too lean when you removed the programmer completely.

Hindsight is 20/20, and throwing salt on the wound isn't going to help, but the second time you found gas in your oil, and seeing it had increased in volume should have been a major warning sign something was seriously wrong.

I sound like a dick. Sorry about that. However, it's fair to say adding an aftermarket exhaust canister, a fuel programmer, and doing the flapper mod and AIS removal were NOT part of the problem with your engine failure.

It is possible that your removing the fuel programmer accelerated the death of your engine though.

The take away here for everyone is if you notice gas in your oil you've got a problem you need to check out immediately.










_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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rsteiger

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Fri Jul 24, 2015 6:06 pm

motokid wrote:
soupbowl wrote:

and pulled out the programmer. removing the programmer the bike was running shockingly well.

Now keep in mind, I'm only commenting on your repeated comments about how you don't think your mods had anything to do with this engine failure, but then you immediately turn around and question/allude to the fact that they might have.

I understand that you had gas in oil prior to removing programmer. I understand that it was getting worse rather quickly.

The reason your bike ran better without it was simple. You went leaner.
Probably too lean. Leaner is meaner is the old saying.

Very few people recommend or feel safe modding the exhaust and air intake while doing nothing to add to the fuel side of the equation. The general theory is Yamaha tunes bikes somewhat lean for emissions/pollution reasons.

I highly doubt your little FmF programmer could force so much fuel into your bike that it'd blow past your piston rings.
Long before that you'd have flames and back-fires coming out your pipe end every time you down shifted. You'd also smell very strongly of gas every time you rode the bike.

Gas in oil is usually a sign of bad rings on pistons which could be due to many different things. It does sound like you were starting to experience a loss of compression and it took making the bike run leaner and leaner for it to feel right.

It's possible you went far too lean when you removed the programmer completely.  

Hindsight is 20/20, and throwing salt on the wound isn't going to help, but the second time you found gas in your oil, and seeing it had increased in volume should have been a major warning sign something was seriously wrong.

I sound like a dick. Sorry about that. However, it's fair to say adding an aftermarket exhaust canister, a fuel programmer, and doing the flapper mod and AIS removal were NOT part of the problem with your engine failure.

It is possible that your removing the fuel programmer accelerated the death of your engine though.

The take away here for everyone is if you notice gas in your oil you've got a problem you need to check out immediately.

Well if we are going down that road then maybe we should never fook with the intake and exhaust to begin with since Yamaha puts a hell of a lot more development time in tuning these motors than any one of us would on a dyno and most of us do it by the seat of the pants.

I went back and looked at my dyno session when I had PCV on the bike and there were quite a few spots where fuel was removed but over all the A/F ration was crap (12.4:1). Why? Because the bike made more power running richer. When you tune it by the butt dyno who knows what the A/F ratio is.

I seriously doubt anything that he did with the mods or the programming caused that failure. The reality is that parts are not perfect and some can have flaws that make it into the manufacturing process. I think SpaceX just figured out their rocket failure on the last launch was due to strut that failed at 2000lbs but yet has a design requirement of 10,000 lbs and bike aren't rocket science.

I went pretty big in tuning my WRR when I first got it but in the end the stock bike suits me fine. I can honestly say this is the last time that I will be messing with a fuel nanny or a Power Commander on a bike. You spend a lot of money for little return.

To each their own.
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soupbowl

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PostSubject: Re: 2010 wr250x engine blown at 7000 km   Thu May 12, 2016 4:01 pm

Just an update, Yamaha rebuilt the engine, costed them 8,500$ and took them 5 months. They gave me 100 km warranty and
the bike has less power then when it was new and stock. The only thing they kept from the old motor was my oil pump cover,
everything else was replaced.
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Jens Eskildsen




PostSubject: Re: 2010 wr250x engine blown at 7000 km   Mon May 16, 2016 5:01 am

Cool. Do you plan to keep the bike now?
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PostSubject: Re: 2010 wr250x engine blown at 7000 km   

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2010 wr250x engine blown at 7000 km
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