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2011crf450r hi compression piston

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What are the pros and cons to changing from a oem piston to a pro circuit hi compression piston what else will in need to change or problems i might run into changing from stock to hi compression and do i have to run racing fuel

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The pro is going to be more bottom end grunt. The con with a ProCircuit is that you spend twice as much money for the piston as you need to. Get a JE. 13.5:1, remap the ECU for it and you'll be amazed. No, you dont need to run race fuel. The only performance con would really be if you were a trail rider that liked slogging along at 14 mph slipping the clutch, it'll build a little more heat. But if youre riding mx, no problems.

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