DT125R ARCHIVE

Okay, But the DTX has a restriction that sounds like what your describing, But its fixable by just earthing a wire or something ^^

Trust me blad!

well the thing with making the ypvs opening earlier, is that you get a little bit better rpm kick when the powerband kicks in, like when you need a strong pull for a wheelie
but that also make you get a bit less power on low rpms, alright? kinda depends on how you drive

edit: it's not a huge difference, but you do notice a difference, it's something between pinned powervalve and standard adjusted powervalve

The low rpms are good for when you drive in traffic and in a city, high rpms are good for acceleration

I wouldn't prefer to sandpaper it to make it smaller though, and also I have no idea if it starts closing when it gets to "fully opened" state

 

Also, the powervalve is originally adjusted for a standard exhaust, so if you have an aftermarket exhaust with a powerband at higher / lower RPMs than the standard, adjusting the powervalve a little bit could be a good idea

-- Edited by zander on Saturday 18th of August 2012 11:09:30 PM

Okay, You could just open up the cover on the side of the cyllinder where the wires are fixed, And see how much it opens, I think mine started closing again after a certain rpm when the restriction was there

Hard to tell yeah, but try pin it open and see if you notice any difference...

You could also try keep going without gearing up in like 2nd or 3rd gear, and if it at a certain amount of RPM just keep going constant and not revving anymore, and by that I mean really constant (like if it would just stop at a certain tone) then it's probably the ypvs closing

the guy on the german forum put sandpaper on a dremel and made to hole bigger instead of opening earlier so it wouldn't start close the other way around xD

Yeah but you dont need a rpm gauge to know if your powervalve is working the restricted or the derestricted way.

And yeah thats what i have been thinking about too zander xD

I sense your making fun of us,

You know when you adjust the powervalve like me and many others have done, It starts closing a bit on the other side, If you just dremel off like 3 mm maybe idk i havent checked how much earlier mine opens 100%, And make the powervalve smooth so that the change isnt very visible you will get a better effect out of that.

You get a better effect of adjusting it the way i have done even tough this means it closes a bit on the other side, So you dont have to be a genius to figure out that if you dremel it off so that it opens 100% at the same time without closing on the other side you get even better effect...

Yamaha proboably spent alot of money figuring out how much compression or how the inlet ports should be too, But this doesnt mean you cant do anything about them to improve them..