On my 30cc and 25cc homelites I found a little hole in the cylinder just above the exhaust opening. I understand this is for easier pullstarting and less kickback in weedwhackers and leafblowers. I plugged these holes with set screws, the compression went up, and the engine power increased probably 25%. I don't know if this is on all their engines.
There is a lot of satisfaction in converting your own engines. Guys are always surprised at how well my planes fly with them. I still use quadras and big zenoahs on heavier warbirds, but I always cringe at the inflated prices of these.
The 33cc saw motor sounds interesting.
Where do you guys get the larger throat carbs for the homelites?