Paul,

I found the same thing. I have converted both types of engines and the 25/30cc types out of blowers/wackers start a lot easier than the 33s out of chainsaws. The 33s require a much sharper flip but they do hand start. Try experimenting with prop postions: 12 o'clock, 12:30, 1 o'clock, etc. Also try using 50:1 oil if you're not already, that seems to make them easier to start.

The only reason I can figure for the chainsaw engines requiring a faster flip is for safety reasons, but that's just a guess. I thought of swapping mags with on of the 25s but the magnets are different.

rsjr started a thread here somewhere about the 33cc engine and he uses a portable drill as a starter.

Jim