i was looking through dk catalog and i seen that the kfx 400 has a 12.2:1 stock compression piston. does this mean you will need to run race fuel right from the factory?
Roostin' Away
Arm chair racerRoostin Away
i was looking through dk catalog and i seen that the kfx 400 has a 12.2:1 stock compression piston. does this mean you will need to run race fuel right from the factory?
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Power User
Teaching quads a lesson
I don't know for sure but I don't think it has that much compression. And if it did I think you could get buy with 93 ocatane. Liquid cooled. I've seem people run 13 to 1 on a 450R with the HRC cam (lots of valve overlap) and use 93 ocatane. The YFZ is 11.9 to 1 compression and requires 91 octane.
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