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There are several possible causes; fuel mixture is too rich, air filter is clogged, or worn piston rings and/or valve guide seals. The latter, however, will most likely produce blue smoke - under acceleration means worn rings, blue smoke under deceleration means bad valve guide seals. Also make sure that the crankcase vent is not obstructed as this will tend to force oil up, past the rings and into the combustion process.
Generally, an examination of the spark plugs will give you a good clue as to what the offender is. Black, sooty spark plugs indicates too much fuel (clogged air filter or mixture too rich). Oily spark plugs means worn engine parts, as mentioned above.
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