If you think "converted chainsaw" doesn't sound as good as "Made for airplanes only", so be it...The G38 was the Green Machine model 7200 chain saw, no longer made.
The G45 cylinder is from a chain saw, the case is made just for model planes, that's why it says Toni Clark on the case..
The G62 uses the chain saw cylinder and a case made for model planes..The ignition rotor and coils on the G45 and G62 are the same, not from any chain saw..The G23 uses the same parts, with a smaller bore in the rotor...
The Walbro HDA 48 carb on the 45 and 62 is used only for the airplane engines..
The crankshafts on the 45 and 62 are airplane only, larger diameter shafts on the tapered ends
than on the chain saws..
The chain saws can be converted, but don't look anything like the airplane engines.
I GUESS IF THESE ARE CONVERSIONS, SO ARE ALL THE OTHERS THAT USE CHAINSAW CYLINDERS...
So what ?? The converted chainsaws are lighter than the airplane engines, about 4 lbs for a 62cc with CD ignition....
If the chainsaws didn't cost so much there would be more "conversions"..It's cheaper to CNC a case from aluminum than it is to buy a magnesium alloy case for a chainsaw, and it can be polished or anodized to look better..Anodize is cheap, maybe $100.00 for 60 or more pieces...Been There..The guys on the night shift used to anodize my parts for a few 12 packs of MGD...
To compare the weight of a Zenoah it must be set up with a CD ignition like all the rest..Makes a big difference...An ignition module weighs about 4 oz, much lighter than the stock rotor and coils..Usually a pound or more....
Just my $.02....
Zenoah engines would be cheaper if a certain distributor didn't have an exclusive....