My cat converter is missing and it didn't "smoke like crazy" a little cloud came out not much at all compared to some peoples.If you cat converter was taken off.. it would smoke like crazy.
I am sure the stuff works... I have used it and it does clean the injectors and pistons..
AS for small air cooled carb. engines.. who knows.. they might have used too much concentration and damaged internal soft parts
it's good to use it about once every 6 months to 12 months as directed
I did half can through vac line and half in gas tank.If you run it through the vaccum system it'll smoke, through the fuel system it doesn't because it all gets burned with the gas. However i put it through my '92 and i think it made it run better. I have yet to run it through the vaccum lines due to the amount of smoke.. last time i did it (on a sc400) the fire department showed up.
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