need 2 know


2 replies to this topic
  • zach400f

Posted June 04, 2008 - 05:03 PM

#1

i need 2 know the spark plug gap on my yz400f ?

and what the compretion is on the piston ? :thumbsup:

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  • teddy81

Posted June 04, 2008 - 05:11 PM

#2

400cc YZ400F 1998-1999 U24ESR-N 0.8 IU24 got this off the internet .8 inches you didnt specify the year. its probably 12.5 to 1 but dont know if any mods or anything was done to it.

  • yamihoo2

Posted June 05, 2008 - 06:09 AM

#3

plug gap .028-.031" (.7-.8mm)





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