,,Well!!,,,FINALLY!!,,,I've found other people that do the same thing as I!!,,,LOL,, I've been converting for 20 years,, I've been doing the bigger engines,,,currently,,I have a twin engine mousqito bomber,,,that has 2 45cc stihl chain saw engines,,running a homemade belt reduction drive. I'm running scale diameter 3 blade props,,the effect is out of this world!! Before McCulloch went belly up,,,those where good engines,,,converted many of them,,something else to concider,,I've converted a couple of the "chop saw" engines,,,these engines are "souped up" at the factory,,,and are real power houses!! I have a 6.8 ci stihl chop saw engine converted,,,and a 3w100,,they are about the same in power,,,but MILES apart in cost!!,,yes,,the single cylinder engine does have a little more vibration,,,but not that bad,, When I turn the flywheel,,,I remove the crankshaft engine,,remount the flywheel on the crank,,,then put it in the lathe,,when you machine off the cooling fins,,they are dead on straight,,,and I make a flat spot to mount my prop hub,,(I also turn them too,,,they look like a spool),,I do as much of this on the lathe as I can,,,when your done,,,it's dead on,,no runout at all,, really doesn't take that long to do,, ok,,,I've rambled on enough,,,if anybody has any comments,,,or questions,,please don't hesitate!!,,