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Post Info TOPIC: how big can the stock top end go


DTR Senior Member

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how big can the stock top end go
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Just wondering what is the biggest size rebore for the stock cylinder without any issues with the powervalve??



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You want to consider to modify the powervalve after every rebore just out of precaution. But 2.00mm is when you need to modify the valve. It's a natural thing on all two strokes to modify the valves.

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The Leviathan Project



DTR Senior Member

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Cool... and the stock bore size is 56cm right??

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Yeah think so

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The Leviathan Project



DTR Senior Member

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I forgot i had a brand new top end under my bed lol
Stock piston is 55.6 :)

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Pretty sure stock top ends are 54.00 or 54.6 depending on whether its a 3bn or a 3mb. One has a sightly longer stroke. I'm pretty sure its

3BN - 56.40mm
3MB - 56.00mm

PJME do mitaka piston kits up to 59mm by the looks of it so im sure they must be able to bore to 3mm oversize safely. They have to be the guys to ask.


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But as Cal says you atleast want to check clearances on the powervalve for every rebore. no 2 valves, bores or pistons will be exactly the same. If you're not sure then best get the company doing the rebore to mod the valve and check clearances too. That way it will be quality work and should you have an issue you can go back to them. I'll be sending a 350 crank, 125 crank and barrels from both off to pjme soon as both here and the 350 forum all reccomend them.

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