We're not talking about the amount of heat produced during combustion, we're talking about the amount of heat that is transfered to the muffler, which is where it counts in the production of smoke. IF you were trying to inject smoke oil directly into the combustion chamber, yes, combustion temp would matter, but your not. The smoke oil is being injected into the exhaust header on a 4 stroke, which DOES run hotter than the same area on a two stroke. Get out your temp. probe and check it.