50v piston question

i see listed on treatland.tv the av7 piston kit, but it comes in 3 sizes, 38.94mm, 38.95mm and 38.97mm. which one do i need? i have a 1978 50v (30mph)

Re: 50v piston question

Downhill Harvey (OFMC) /

It might be stamped on top of the piston. Is your piston stamped anywhere?

Re: 50v piston question

Look on the cylinder deck - there is a letter stamped in there (A thru S) to tell you the size, piston needs to be matched.

I attached a chart


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