i went a little too far with the portwork which, in turn, had me running too many rpms for the big end roller. so i picked up a new motor from bgf and ripped it apart. i also had a gilardoni 70cc kit for a puch project that ate the last piston and rod it had in it
i cleaned up the cylinder and intake port and now i have this
and this
this kit has a bore of 47mm which not only gives me the same displace ment as stock, but also enables me to run the stock 10mm wristpin and a roller bearing instead of the 12mm and a bushing. only time will tell if this piston will survive.
i had to weld up the outside of the transfers before i ported the cases
what i had to match