2001 Yamaha YZ426F

2 replies to this topic
  • 0z87

Posted March 07, 2011 - 10:42 AM


I just had my valves adjusted, new tensioner,and cam chain. I am having major problems getting the engine to fire up. I have good spark and the color looks a little lean. Any suggestions to carb setting for fuel and air would be greatly appreciated.

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  • baxterj787

Posted March 07, 2011 - 12:09 PM


Check your timing. The flywheel has the following marks as seen through the small inspection cap: I-I I

The third I is TDC. Remove the spark plug before turning the motor. It turns much more easily w/o the sparkplug installed. From there, make sure the camshaft alignment dots are at 9 o'clock and noon (exhaust) and noon an 3 o'clock (intake).

I mis-timed my 426 once. They won't start that way.

  • 0z87

Posted March 08, 2011 - 04:49 AM


Thanks baxterj787. I will take a look at it . I gave the carb a good cleaning last night.
Starter jet and pilot jet were partially clogged.

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