RE: ASP.91 glow to gas?
An ABC engine depends on the temperatures developed when running on glow fuel. After breaking an ABC engine in, one should run it on the same factory recommended fuel used for break in; not change nitro contents, as with different nitro contents the engine running temperature changes and this will affect the piston/liner fit. For this reason it is not recommended to run an ABC engine on gasoline, as the operating temperature will be considerably higher, and you will have problems with the piston/liner fit.
Other members have encountered this problem as well, and reported it here in the forum. One should only use a ringed piston type engine when using gasoline or gas/glow mixtures.
AV8TOR