Decarbonizing (2-Stroke Engine) - Honda Motorcycle Service Manual

MAINTENANCE
DECARBONIZING (2-stroke engine)
Carbon accumulation occurs more rapidly in 2-stroke
engines than 4-stroke engines because 2-stroke engines burn
engine oil. If the build-up of carbon is not removed
periodically, the carbon accumulation increases to an
excessive amount, causing hot spots on the cylinder head and
piston crown. This may cause knocking dueto preignition and
may cause poor engine performance. Accumulated carbon in
the exhaust port hinders the flow of the exhaust, causing a
drop in power output. Therefore, removal of accumulated
carbon should be performed according t o the maintenance
schedule in the Model Specific manual.
CAUTION
.
When removing carbon, be careful not t o damage the
combustion chamber, piston and cylinder.
Take off the cylinder head and remove the carbon from the
piston crown when the piston is in the top dead center
position.
Remove carbon from the combustion chamber area of the
cylinder head.
Take off the cylinder and remove accumulated carbon from the
walls of the exhaust port.
Remove any remaining carbon within the cylinder.
In liquid-cooled engines, be sure to remove carbon particles
that may have fallen into the coolant jackets around the
cylinder by blowing them out with compressed air.
Refer to the Model Specific manual for the proper procedures
for cylinder and cylinder head removal and installation.
COMBUSTION
CHAMBER
I
EXHAUST PORT
Date of issue : March, 1995
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