Hi guys!
I think it would be a good thing if we made a list with the engines we have converted, see this example (not real data):

ENGINE: 40cc Homie (how big the engine is)
ORIGIN: Homelite 240 chainsaw (where it came from)
WEIGHT (converted): 2.4kg
RPM: 7200 (20x8 prop) (indicate prop used)
THRUST: 9kg (if you can manage to measure it, indicate prop used)
CONV. LEVEL: 6 (being 1 the easiest to convert and 10 !QUOT!you'd better look for another engine!QUOT!, I think this will help when purchasing an engine).
NOTES: crankshaft sticks out of both sides (to put any comment you find useful).


In my very short experience, I've found that string trimmer engines would have a lower conv. level (that is, they're much easier to convert) than leaf blowers or chainsaws, in this order.
Well, it's just an idea