Yamaha 426 high comp piston help



1 reply to this topic
  • carlloktm

Posted July 29, 2014 - 11:24 AM

#1

Hi I'm rebuilding a knackered engine and thinking of a high comp 13.5.1 piston

Is there anything else that needs doing if I fit it? And Will it need re jetting

Iv got a standard one and this high comp one and can't decide witch to put back in

Thanks

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  • LoonRider

Posted July 29, 2014 - 03:02 PM

#2

Not sure about rejet but you will need to run a higher octane gas





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