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 Thumper Racing is developing a 310/320 kit?

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+26
4play
trevorb
Prairieparson
bmdtech
silentwolf
Dryer
Biglake
nwrider
sswrx
RichardU
pbnut
ejfranz1
Niewski11
CaptainPwnage
bobbytohn
Arkmage
deerHater
skidmarx
BuilderBob
millert85
ramz
motokid
Jäger
oic0
trav72
BoredAzHell20
30 posters
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyMon Apr 23, 2012 2:50 pm

The 310 kit from Thumper Racing comes pre-balanced. Install it and go! I was told that's part of why it's so pricey; they balance the assembly for you.
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nwrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Dec 20, 2012 11:15 am

Any new information on the bore/stroker kit? Nothing is shown on TR's website.

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oic0

oic0



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Dec 20, 2012 12:10 pm

While you're waiting you can probably buy a used DRZ for about the same amount as it will cost :P Or sell your bike, pair that with the money, and pick up a used KTM640 ;)
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyFri Dec 21, 2012 11:15 am

nwrider wrote:
Any new information on the bore/stroker kit? Nothing is shown on TR's website.

You have to call them. They said they were trying to get them up on the site a long time ago, but I guess that fell by the wayside. Call 'em up and tell 'em you want the 310 kit!
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nwrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyFri Dec 21, 2012 11:28 am

I was curious as to the final cost of the mods and whether or not they have any dyno runs on this conversion to compare with the 280 kit. I guess I'll have to contact them directly.

Thanks
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Biglake





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyFri Dec 21, 2012 9:50 pm

I think eddie sinerous (sp) (he posted about it on thumpertalk) is advertising 40 hp from the 310 or 320 kit with porting and cams.
You could contact him for prices too.
I'd rather skip the cams and have 35ish hp with more low end tho, I ride off road mostly and want all the low end I can get. The 40hp kit is aimed at the sm guys.
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptySat Dec 22, 2012 11:29 am

nwrider wrote:
I was curious as to the final cost of the mods and whether or not they have any dyno runs on this conversion to compare with the 280 kit. I guess I'll have to contact them directly.

Thanks
When I was in e-mail contact with them I was told $1200 forr the parts. You'll need some gaskets on top of that for the engine teardown.
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nwrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyTue Jan 29, 2013 10:15 am

I left a message for Thumper Racing several weeks ago. No followup from them. Not what I would call responsive! As it is, I was able to buy a new 280kit with the sleeve already installed in an extra cylinder from a fellow in Kansas. Should get it by the end of the week. It seems like a better compromise for additional low and midrange power vs. $$$.
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Dryer

Dryer



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyTue Jan 29, 2013 11:40 pm

I would love to hear your thoughts on install etc once you get it. I am very much contemplating this bb kit for this spring. Ive done a lot of reading on the kit as well as other bbs. I think the 280 makes the most sense as the stroker sounds a bit dangerous. Guess Im just looking for that extra "do it" to push me over edge. ;)
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nwrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Jan 30, 2013 9:42 am

Dryer,

I'll try to do that. However, I probably won't get started until later in February. I'm going to try doing it with the engine still in the frame. Follow the link in AdvRider: http://www.advrider.com/forums/showthread.php?t=621532 where Highfive does an excellent job of documenting the process, although he installed a Athena 290 kit. Later in the thread, others who've also done it offered additional suggestions to shorten the process.

My bike is stock, except for a FMF programmer. I'll be happy if it gives the same low rpm performance of my 2002 Honda XR250R.
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Dryer

Dryer



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Jan 30, 2013 10:02 am

Thanks for the reference but that is the exact thread that gave me the confidence to think I could handle the install. If our geography was remotely closer it would be great to knock them out together, but things are never that easy it seems.

Coming from solely an programmer it should be a very noticeable change for you, Im about out of engine mods so the bb is the nearly the only thing left that appears worthwhile.
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silentwolf

silentwolf



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Jan 31, 2013 8:06 pm


I just hunted down this thread again after coming across this...

http://www.ebay.com/itm/181065410551?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649


So the question here, is that a sleeve that need to be installed?



Tempted. :hmmm:
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BuilderBob

BuilderBob



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Jan 31, 2013 8:38 pm

silentwolf wrote:

I just hunted down this thread again after coming across this...

http://www.ebay.com/itm/181065410551?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649


So the question here, is that a sleeve that need to be installed?



Tempted. :hmmm:

You're right. It's a sleeve that must be pressed into your stock cylinder after it is bored.

I have one of TR's 280 kits waiting for me to conjure up enough motivation to install it. It uses the same sleeved cylinder and piston, but it's installed on the stock crank.
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyFri Feb 01, 2013 5:55 am

Thanks for the link! It is mine now!!!

Now I really can't wait to get home to install it.

It comes with a programmer I don't need though, so keep your eyes on the For Sale section in May if you're looking for one on the cheap.
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silentwolf

silentwolf



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyFri Feb 01, 2013 7:43 am

pbnut wrote:
Thanks for the link! It is mine now!!!

Now I really can't wait to get home to install it.

It comes with a programmer I don't need though, so keep your eyes on the For Sale section in May if you're looking for one on the cheap.

I've actually been thinking about the EJK programmer.

I'll send a PM
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bmdtech





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyTue May 28, 2013 6:39 pm

They still don't have the kit listed on the webpage. I have called them and left VM for call back. Is this kit just vapor ware at this point?? Or have they installed and tested this system?
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyTue May 28, 2013 6:56 pm

I hate to say it, but unknown.

I bought my kit off of eBay rather than from Thumper directly. To my knowledge there has not been a confirmed install/ride report documented online. There was a guy over at Supermotojunkie.com who was getting the kit installed. The shop hired for some of the work botched the job repeatedly. I think he had it running at one point but he ran into issues with coolant leaks from faulty installation, etc. etc. That was pretty much the last update from that guy. You can follow along here.

If you can stand to wait a while longer I'm going to be the guinea pig for this forum. I got home from deployment mid April, broke my foot 4 days later, and have been pretty much useless ever since. I'm also going on vacation here for a month, so there's another delay. I'm just going to ride it as is until the winter months and then break it down. (AZ winter; I know. It's still cold at night when I work!)
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nwrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptySat Oct 26, 2013 7:54 am

pbnut,

I'll be looking forward to your experience with the TR kit installation. I was going to tackle mine this year but didn't get around to it. Mine still has less than 3k miles on it so there's no rush as far as the engine's concerned. I've had to recalibrate my riding by just wringing the WR's neck compared to the XR.
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Oct 30, 2013 8:03 pm

I should update then.

I bought an Athena cylinder. As it turned out it was a stock bore (77mm) and not the 83mm required. I've returned it to Athena, but wouldn't you know it they're out of stock on the 83mm bores...

I decided I didn't want to mess with re-sleeving, especially when a correctly sized cylinder made to original specs already exists (at least when in stock...).
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Prairieparson





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptySat Nov 02, 2013 5:38 pm

My WRR is bone stock except for the seat, skid plate, windshield and saddlebags. I wouldn't think of changing the motor. That engine is just amazing to me. I love it.
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pbnut

pbnut



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Feb 06, 2014 11:48 pm

Thought I'd post some notes I had jotted down before throwing them away.

Stock bore: 77 mm

Athena bore: 83 mm

Athena piston weight: .4812 lbs or 7.69 oz.

Thumper Racing CP 3 ring piston: .4645 lbs or 7.43 oz

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trevorb





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Mar 05, 2014 4:57 pm

pbnut wrote:
Thought I'd post some notes I had jotted down before throwing them away.

Stock bore: 77 mm

Athena bore: 83 mm

Athena piston weight: .4812 lbs or 7.69 oz.

Thumper Racing CP 3 ring piston: .4645 lbs or 7.43 oz


Have you had this installed yet?

Also, has anyone seen a dyno on the 310 kit yet? I see one for sale on ebay but it doesn't give any gains info.
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4play

4play



Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Mar 05, 2014 5:31 pm

I bought his kit & I'm assembling a spare engine with it. It works out to 306cc's
Here is a dyno sheet that was posted by Eddie Cisneros with numbers I believe are realistic.
This is the Hotrods stroker crank with an Athena kit which is also 306cc's

I had him port my head, my spare cylinder is at Thumper having the sleeve installed & honed to size now.
With cams, they've hit 40HP. I'm more interested in grunt, so I don't plan a cam change at this time.



here is a dyno graph of the progress so far.

run 3 is how our test mule arrived to us. full fmf power core 4 system with power bomb head pipe
run 11 is power commander 5 added,tuned with air box door off.
run 32 is kn filter added and pc5 fueling corrected
run 55 is +6mm bore,+3mm stroke,SSW head with the pc5 corrected and the same pipe


Thumper Racing is developing a 310/320 kit? - Page 3 Wr250x4
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slvdirtrider





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyWed Mar 05, 2014 8:31 pm

Thanks for getting me all excited. I have my 306 engine complete. Its back in the frame. I have the new forks installed and the rear shock on. Tonight I am going to try and get the rest of my winter project going for the summer. I am going to post pictures of my build after I get done.


4play wrote:
I bought his kit & I'm assembling a spare engine with it. It works out to 306cc's
Here is a dyno sheet that was posted by Eddie Cisneros with numbers I believe are realistic.
This is the Hotrods stroker crank with an Athena kit which is also 306cc's

I had him port my head, my spare cylinder is at Thumper having the sleeve installed & honed to size now.
With cams, they've hit 40HP. I'm more interested in grunt, so I don't plan a cam change at this time.



here is a dyno graph of the progress so far.

run 3 is how our test mule arrived to us. full fmf power core 4 system with power bomb head pipe
run 11 is power commander 5 added,tuned with air box door off.
run 32 is kn filter added and pc5 fueling corrected
run 55 is +6mm bore,+3mm stroke,SSW head with the pc5 corrected and the same pipe


Thumper Racing is developing a 310/320 kit? - Page 3 Wr250x4
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trevorb





Thumper Racing is developing a 310/320 kit? - Page 3 Empty
PostSubject: Re: Thumper Racing is developing a 310/320 kit?   Thumper Racing is developing a 310/320 kit? - Page 3 EmptyThu Mar 06, 2014 9:07 am

4play wrote:
I bought his kit & I'm assembling a spare engine with it. It works out to 306cc's
Here is a dyno sheet that was posted by Eddie Cisneros with numbers I believe are realistic.
This is the Hotrods stroker crank with an Athena kit which is also 306cc's

I had him port my head, my spare cylinder is at Thumper having the sleeve installed & honed to size now.
With cams, they've hit 40HP. I'm more interested in grunt, so I don't plan a cam change at this time.



here is a dyno graph of the progress so far.

run 3 is how our test mule arrived to us. full fmf power core 4 system with power bomb head pipe
run 11 is power commander 5 added,tuned with air box door off.
run 32 is kn filter added and pc5 fueling corrected
run 55 is +6mm bore,+3mm stroke,SSW head with the pc5 corrected and the same pipe


Thumper Racing is developing a 310/320 kit? - Page 3 Wr250x4

That looks like a 50% increase in power from stock. That has to feel like a completely new beast! Thanks for sharing the info.
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