Sparky,
I have this JC60 twin also and I was wondering the same thing. I also have a OS GT15 with a cm6 spark plug. OS has come out with the OS GGT15 which is the same engine I have and it is a golw version. So if the OS GT15 can be converted to a glow plug I don't see why other gas engine can't be. You would need to purchase a 10mm to 1/4 adapter so the gas glow plug could be used. This is a interesting question and I might just give it a shot. Got nothing to loose except for the cost of the adapters and glow plugs.
