Hello i got a many years Tomos tuning project. The motor is a Tomos APN engine with 5 gears (same stroke as puch) And i got transfers welded and recut for puch cylinder. Right now i got a PSR 70cc and its a exact copy of TCCD 70cc. I have driven it many miles but it has always lacked the top end. Then yesterday i checked port timings with a degree wheel and found out my port timings were
So yea Horrible! And it has been ported at exhaust 1.5mm and intake (skirt)
So i put 1 2mm washer to each cylinder stud and my port timings got much more suitable for a shifter like i have!
125° Intake (will be ported more trugh skirt shortening)
BUT. Now when piston is at BDC the pistons boost port cutout is visable (not ported) about 2.5mm. Would this be a problem for performance?
I already have made a 1.5mm spacer and gaskets to use