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Discussion Starter · #1 ·
i was wondering how big of a bore u can go on a set of stock cylinders wondering if u could go to a 68 mm
 

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I believe you have to get big bore sleeves if you wanna go over .100 over bore.....

I had a tyson big bore kit that used 68mm pistons. bike an good for a dune port.
as stated above though, you lose alot of transfer area going that big. step up to a cub (68mm bore) or a super cub (72mm bore) if ya want a high hp big bore cylinder
 

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Exactly right 479. 100 over is 66.5mm, and they might not even do that? (depends on how centered your machinist kept your bores to center)? My duner is a 72.5 bore h2 piston, awesome power for the day, but they are a thing of the past now. Cubs just straight smoke em for less money.
 
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