lack of power


1 reply to this topic
  • 317pryan

Posted April 20, 2009 - 09:54 AM

#1

I bought a yz400f and when you get on the throtle it hesitates then takes a long time to get up to speed any ideas on what it my be. carb is clean valves are good compression is good new head, has uni filter no baffle jets are 45 and 180.

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  • TIG88

Posted April 20, 2009 - 12:41 PM

#2

Check your timing and make sure the passages are clean in the carb.





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