You need:
cilinder,
piston,
rings,
Piston pin,
piston pin snap rings (2),
Piston bearing.
cylinder gasket,
head,
head Orings,
Head water hose gasket,
Reed Valve spacer.
Reed valve gaskets (2).
You also need to take the power valve from the 250 and place into the 300, I would recommend to replace PV bearings too.
have fun,
j.
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