13.5-1 piston on pump gas?

Will a 13.5-1 piston run on pump gas in my 2000 426?

Of course it will, but it may ping. If you hear it pinging then you need to blend some race fuel with pump fuel.

Well I dont want to run race fuel at all. I know we can run 13.5 pistons just fine on pump gas in the crf450 but I was wondering if the 426 can do it as well.

Under most circumstances, yes you can. Only if the engine is lugged hard at a lower rpm will it ping on reasonably good pump gas.

...so how much actual benefit is there to running a 13.5:1 piston?

...so how much actual benefit is there to running a 13.5:1 piston?

Increased torque from idle to mid-range. They don't do much on the top end, but from the bottom thru the mid range they rip. I wouldn't rebuild my motor without one. :thumbsup:

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