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Ok, I complet;y emptied out the gas tank, sprayed just a bit of carb cleaner in the fuel inlet on carb. New filter, fuel line. Trying the non ethanol gas (90 octane)). I did notice the head bolts 1 or 2 were not tight (to torque). So retorqued all head bolts. Not sure if this could have been...

I think it's more flakey sooty and it smells a bit like gas or fuel

ok, will try that first before rejetting or down-jetting carb.

Ok thanks and np! When you rub finger inside the exhaust (at the end of pipe) finger is full of soot.

The additive or just plain using higher octane? or both? Had a buddy tell me should run with a highr octane.. could try and use the lower non ethanol stuff.. Thanks for the reply