About the Airbox Flapper

Just to confirm that the flapper is stuck tight. It's OK?
Thanks

looks okay!

That's how mine looked after I siliconed it.

Thank you, now I am sure.

There is really no reason not to gut the airbox. If I can do it, anyone can do it

Seems like a lot of work.I just put a BB in the vacuum line at the servo.door stays open all the time since there is no vacuum to operate it.....

What is BB ??

You did what?

Dude... I know you're going to say "it's not going to come loose," but that just sounds like a bad idea all around.

Gutting the airbox was not a lot of work. Took all of like half hour maybe.

Big-t wrote:

Seems like a lot of work.I just put a BB in the vacuum line at the servo.door stays open all the time since there is no vacuum to operate it.....

angelWR wrote:

What is BB ??

Like a small ball bearing. It's often shot from an air-rifle.

Big-t wrote:

Seems like a lot of work...

It's not really. Plus..you open up space under seat for other tid-bits of joy and happiness.

What motokid said. I have serious OCD, so cleaning up the under-the-seat area felt soooooo good. Where that damn solenoid used to be, I now have my FMF programmer. And there is plenty of space for the 3CS too. And it's so clean and pretty!

motokid wrote:

It's not really. Plus..you open up space under seat for other tid-bits of joy and happiness.

I forgot---why do we want to remove this flapper ?

More airflow into the airbox.

I cut a big hole in the top of my air box. I do not think having the flapper permanently open provides enough air.

Is there some way to tune for the added airflow without a tuner? I was reading somewhere (lost the link) about a way to hack into the ECU under diagnostic mode, and adjust the mixture... as one would with a pilot screw.

I don't believe you can really adjust much in that diagnostic mode. A tuner really is the way to go. Tuners are relatively cheap, engines are not.

Corprin wrote:

Is there some way to tune for the added airflow without a tuner? I was reading somewhere (lost the link) about a way to hack into the ECU under diagnostic mode, and adjust the mixture... as one would with a pilot screw.

SheWolf wrote:

More airflow into the airbox.

seems like a good idea... other than weight redux is there a performance gain or mpg increase, a leaner mixture, a hotter engine, ... if it is all beneficial to get rid of it, why would Yam a Mama spend the time, effort and expense of installing it?.

Same Q for the exhaust servo?

I just want a super reliable moto that will get me there, in one piece. Gotta fix the range problem though...

thanks, Gary

These days, a lot of these systems are engineered and installed at the factory to meet strict regulations. Mostly noise and emissions in EU and in CA and some other states. Also, the bike is tuned conservatively to make it as reliable as possible.

Now, having said that, doing these mods can't really make the bike less reliable, if you don't go crazy or screw something up. The engine is starving for air and choking on a plugged-up exhaust, which is why doing these mods actually has a net effect. May members have done both air intake and exhaust mods, and I don't believe we've seen any reliability issues.

taoshum wrote:

seems like a good idea... other than weight redux is there a performance gain or mpg increase, a leaner mixture, a hotter engine, ... if it is all beneficial to get rid of it, why would Yam a Mama spend the time, effort and expense of installing it?.

Same Q for the exhaust servo?

I just want a super reliable moto that will get me there, in one piece. Gotta fix the range problem though...

thanks, Gary

Does the flapper keeps water out in case of a fall during river crossing ?

Dancamp wrote:

Does the flapper keeps water out in case of a fall during river crossing ?

No. The flapper is only closed at certain rev levels. You have a lean sensor that shuts bike off when horizontal.

When bike is not running flapper is open.

Quote :

You did what?

Dude... I know you're going to say "it's not
going to come loose," but that just sounds like a bad idea all around.

30 to 40 years of defeating some of the most useless crap installed on cars,I find the simple mods work the best and they are reversible.

Just saying,it seems like a simple solution as opposed to gluing the door shut,that is assuming you have enough sense to use a large enough BB....


I'm old school,really appreciate reading all the mods,but I also like to test each mod as I go to see what works for me as opposed to just ripping it all out and then trying to sort it out.

Mr.Metal wrote:

I don't believe you can really adjust much in that diagnostic mode. A tuner really is the way to go. Tuners are relatively cheap, engines are not.

Who would have thunk it, it was in this forum all along!

https://wr250rforum.forumotion.com/wrr-general-discussion-f3/wr-taco-in-diagnostic-mode-t1141.htm

discuss.

It's there for a reason. I dialed mine in and it helped with smoothing things out.

SheWolf wrote:

It's there for a reason. I dialed mine in and it helped with smoothing things out.

When I bought my bike it came with the baffle removed from the pipe. I figured the slight cough each time I goosed the throttle was caused by this, so I reinstalled the baffle. Viola, the problem was rectified. After reading that thread, I am still left with a couple questions. First and foremost, if I remove that baffle again, would the CO adjustment be proper to get the idle and throttle response back?

Big-t wrote:

Quote :

You did what?

Dude... I know you're going to say "it's not
going to come loose," but that just sounds like a bad idea all around.

30 to 40 years of defeating some of the most useless crap installed on cars,I find the simple mods work the best and they are reversible.

Just saying,it seems like a simple solution as opposed to gluing the door shut,that is assuming you have enough sense to use a large enough BB....


I'm old school,really appreciate reading all the mods,but I also like to test each mod as I go to see what works for me as opposed to just ripping it all out and then trying to sort it out.

I'm old school too, therefore look carefully to make mods. This very well explained:

http://www.wrrdualsport.com/tech-guide/air-intake/68-flapperrem

but my problems with the language made me doubt, as in this forum there are good people, did not think someone would have any problem. I think that is a simple mod.