Briggs Motorsports piston,rings and clips. New in box. Perfect for someone who wants to upgrade over the standard Briggs piston. This is the chrome plated piston so it will be compatible with a aluminum bore engine. I would trade for a new unchromed raptor III piston or maybe something else...
Easiest way is to just replace the crankshaft with a good bushing crankshaft. Better yet change both the crankshaft and sidecover with a bearing model. Then you would have a dual bearing engine.
I have a new one in the box and a used one that mics out at .9985 in. These are good cranks for kart racing because the rod journal comes factory hardened and weigh less than the newer ones. # on box is 397093 date code-p 8502. hand written #260858 ?
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