preivers: Thanks for your reply. If any of these engines has needle bearings on rod, it seems like they may even run on glow fuel. Remove all heavy ignition parts. The lube part should work like common 4 stroke glow engine. A cam for torque could be developed...for those with master skills!! The sound of a 4 cycle engine and some are more fuel efficient ... is the draw to these engines. We do not have to re-invent the wheel...but we can make the wheel better! Thanks Capt,n