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post #1 of (permalink) Old 06-18-2007, 10:12 PM
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HELP! yz125 wont hit powerband

I ride a yz 125 2004, and it will not hit the power band. Recently i had the top end rebuilt before this season, procircut exhaust, and a new clutch.

I recently noticed that there is alot of oil comming out around the exhaust where the exhaust comes out the engine. I had cleaned the carbs and dont think that is the problem, and i am leanin twoards that the piston ring is bad. any ideas? thanks
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post #2 of (permalink) Old 07-15-2007, 06:14 PM
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ever thought that it may be your gasket on ur headers r worn.
(im not sure if headers is used in terms of dirtbikes but what ever conects the exhaust to the engine)
post #3 of (permalink) Old 08-09-2007, 12:11 PM
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Red face Retrace your steps!

Did this bike manage to hit it's power band before doing your 'top end' rebuild &/or replacing it's Xhaust?
Remembering of course that two strokes live or die by their Xhausts and squish band ....

I would suggest reverting back to the original Xhaust first , (as the new one may well require re-jetting ), and if that fails to remedy the prob. ... then check head gasket thickness, (I'm assuming you didn't re-use the old one?), and then check your piston to head clearances, as this is ultimatly your squish band. ... and then there's the ol' favourite ... Who did your rebuild? (did they maybe break a ring on installation), and ... was a new piston and / or rings involved in this 'top end' rebuild?

Wrt oil and the Xhaust ... It's a two smoke ... It burns and leaks oil! ... deal with it or get an underpowered 4 stroke
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