Posted by RAB on July 04, 2009 at 12:28:47 from (195.93.21.10):
In Reply to: smoking 2n posted by Robert W. on July 04, 2009 at 08:12:52:
Look at your plugs again. If the fouling is light fluffy black carbon 'dust' your mixture is far too rich, which is indicated by your black smoke.
"as recommended from this site" can mean anything. The information may be worth exactly what you paid for it.
The engine should be at normal operating temperature and you lean it out until it just runs smooth at idle and has the proper setting for the power side. The operator's manual will tell you how to do it and the final settings may be way off from any values supplied - as these are simply ball-park settings to get the engine running.
Normally you adjust the main jet system for good running (above idle speed) and then adjust the slow running setting, so the engine will keep running smoothly at idle, and then re-adjust the power setting as necessary, then back to the idle setting, repeating the cycle until both need no further adjustment.
If a satisfactory adjustment cannot be found, then maybe the carb is, in this case, leaking by the float control valve, or the float level is set too high, or the main jet is the wrong size or the wrong venturi is fitted. Leaking past the float valve should be apparent by the carb flooding, when stood with the engine off.
If plug fouling was oil related (usually associated with some blue smoke) a new carb will not make things any better.
If it had a burned or chipped valve it would affect how it ran (back-firing) but these things do not usually happen at the same time as changing the carb. You know how it ran before - it should not run any worse than that, with the new carb.
I am wondering why a new carb was fitted. Rust is easily cleaned from a carb and would normally result in jet blockage rather than too-rich fouling. Rust getting from the tank into the float valve could cause your type of problem, if that is really the problem.
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