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over size piston ?

looking to up the cc on my m21 and found this site?

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Re: over size piston ?

There are pistons available to enlarge your M21 up to 720 cc. Ian Wright knows more about these pistons, Ian is often on this forum.


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Re: over size piston ?

Aloha Tony,

Have a look over at the technical section, under “A little extra power” and you’ll find some info.


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