Help!! Piston Prob!

[BigBore440EX]

ok i got a motor and the guy said it was 416 cc so i juss went and bought a new 12: 1 416 piston and im not sure if itll work it said standard bore piston but if my sleeve and standard bore will it stil work?

[400exrider720]

The piston will work but you will need to get the sleeve bored which costs like $50.

[BigBore440EX]

well heres the prob the sleeve is n really good condition teh only reason im buyin a new one is when iw as installing gaskets i accidentally leaned over and hit the start button and my pisotn skirt shattered on my case

[GPracer2500]

Originally posted by BigBore440EX
...i juss went and bought a new 12: 1 416 piston and im not sure if itll work it said standard bore piston....

Which is it? 416 (87mm piston diameter) or standard bore (85mm piston diameter)?

Also, be aware there is a next to zero chance you'll be able to run pump gas with a 12:1 400EX piston.

[BigBore440EX]

The Piston is 87 and yeah ima buy sum 103 octane fuel and mix it w/ 93