2010 Yamaha STX 125 intake and exhaust valve clearance

SOURCE: glowing exhaust header yamaha wr250f

It won't be valve timing or clearance. The fuel/air mix would be the culprit. Clean the carburetor with special attention to the idle circuit. Remount the carb with new manifold gaskets. A manifold air leak will mess up the mixture. Also, get a new spark plug one heat range colder than stock. Hope this helps out!

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SOURCE: What are the valve clearances of the engine of

Valve clearances are
in 0,12 mm
ex 0,15 mm
on cold engine

SOURCE: 2007 YZ450F - What is the valve clearance?

See the diagram below. Cold, the intake sets at .004 to .006 The exhaust sets at .008 to .010

SOURCE: what is valve clearance for a 250 yamaha timberwolf

what an *******. If I had a manual or my library had one I wouldnt be asking the question. If I need help fixing something dont tell me to go jump in a lake just dont answer

SOURCE: what are the Valve clearances for a 2004 yamaha yz450f

Valve clearance (cold):

Intake:
0.10 ~ 0.15 mm (0.0039 ~ 0.0059 in.)

Exhaust:
0.20 ~ 0.25 mm (0.0079 ~ 0.0098 in.)