I tried this in the Gas Engines Forum and was pointed here...

From past experience with 2 stroke gas engines (motorcycle related), I know there is usually a lot of clean up and fine tuning available on mass produced engines. Things like matching ports, cleaning up casting marks, matching gaskets to the ports, setting an accurate squish band, etc. Are these things still an issue on our model engines or are they pretty well taken care of in manufacturing? The two specific motors I am thinking about are the Brillelli 40cc and the ZDZ 40. How much improvment is usually realized by sorting these out on an otherwise stock engine?


Thanks,
Mark