13.5-1 piston on pump gas?

5 replies to this topic
  • GBC

Posted June 11, 2007 - 06:55 PM


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

  • 642MX

Posted June 11, 2007 - 07:10 PM


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

  • GBC

Posted June 12, 2007 - 07:22 AM


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.

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  • grayracer513

Posted June 12, 2007 - 07:49 AM


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.

  • whyzee426F

Posted June 12, 2007 - 08:05 PM


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

  • 642MX

Posted June 13, 2007 - 09:30 AM


...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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