ENGINE
2.54
Piston Wash and Spark Plug color
Changing temperature, barometer, altitude, and fuel supply are just a few of the factors that can affect the day to
day performance of your engine. That is why using Exhaust Gas Temperatures (EGTs) are important for maintain-
ing optimum performance.
There are two methods for helping you determine what the EGTs are for your machine. Piston wash and the color-
ing of your spark plug.
The piston wash is by far the most valuable tool in concluding EGTs, with the spark plug color running a distant
second. Use the illustrations below to help you establish the EGTs for your machine.
n If the wash is 1/4” - 3/8” and cocoa
brown, the machine’s EGTs are just right.
n Wet and Black wash indicates too rich a
fuel mixture
n A dry, ash colored piston indicates too lean
a mixture for the operating conditions.
n If the plug is light to cocoa brown, the
machine’s EGTs are just right.
n If the plug is wet or very dark, the fuel is
running too rich.
n A ash white plug with speckles indicates
too lean a mixture for the operating condi-
tions.
Piston Wash
Spark Plug Color
Once the proper jetting is established, you can reference the EGT gauge for your baseline numbers. Then, if there is
a rise or fall of 25 degrees, you must jet accordingly to return your EGTs to the baseline numbers.
Correct
Correct
Wash
Dry
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