Re: BlacksmokeBackfire

Posted by Steve - IN on April 09, 2003 at 16:03:35 from (12.222.31.186):

In Reply to: BlacksmokeBackfire posted by J.Chesher on April 09, 2003 at 15:14:30:

J.Chesher,

In addition to what Mark said -- a couple of ideas:

Black smoke is usually an indication of a carb that's running really rich and/or incomplete combustion of all the mixture in the cylinder.

You might check for an obstruction in the air flow, a stuck choke, the jet settings and float level in the carb. The situation you describe could be a carb running without enough air, or way too much gas.

You could also have an igntion timing problem -- the plugs firing late as the exhaust valve is opening. This could also cause the backfiring and incomplete -- black smoke -- combustion.

Meantime, whether the cause is one or the other or a combination of both, you've probably got some black soot on your plugs which will need to be cleaned as well.

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