need 2 know

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

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

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.

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

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