Question about 2004 Yamaha TT-R 125 LE

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My sons TR90E has developed a lean miss. I have cleaned the carb and replaced the Air and Idle screws with new sets from Yamaha. I have not been able to adjust out the miss. It developed the miss after riding in the Dunes at Moses Lake, Wa. He ran it very hot, I don't know the valve lash clearance, that was my next check. Any ideas??? p.s. the site doesn't give me the option of the TT-R 90 E Bike.

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Reset the air and idle screws. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install new carb manifold gaskets and be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.

Be sure the plug wire fitting is clean and is a firm fit to the plug.
With engine cold, go with .002 valve lash on the intake and .003 on the exhaust.

Posted on Apr 13, 2009

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< < READ CLOSELY > >
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Please rate this solution. Thanks!

Apr 17, 2009 | 2003 Yamaha YZ 125

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