Color Of Exhaust Gas - Branson 6640C Operator's Manual

PERIODIC MAINTENANCE & ADJUSTMENT

13. COLOR OF EXHAUST GAS

The exhaust gas may be a little black at the time of start-
ing the engine, but normally its color is clear.
Black – incomplete combustion due to too much fuel
intake.
White – misfiring or cold temperature.
Blue – burning of engine oil
If the color of the exhaust gas remains black or white dur-
ing operation, have the tractor inspected at your nearest
authorized dealer.
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