5 - 26
CHECK OF VALVES AND GUIDES
HEAD DISTRIBUTION
Eliminate:
•
The carbon deposits (5) (from the contact surface and valve
seat) Fig. E.
Check:
•
the contact surface of the valve (7) Fig. F
If there is any pitting/wear, grind the contact surface of the valve.
•
end of the valve stem (6) Fig. F
If there is a shape or a diameter of the mushroom that is larger
than the body of the valve stem, replace the valve.
Measure:
•
the eccentricity of the valve stem Fig. G.
If not compliant with specifi cations, replace the valve.
NOTE:_________________________________
If installing a new valve, always replace the relevant guide
If the valve is removed or installed, always replace the oil
seal.
Valve
Valve stem eccentricity
Intake
0.01 mm
Exhaust
E
F
5
6
7
G
COPY - Moto GB - Grant Martland - grantmartland@motogb.co.uk
Summary of Contents for TRK 502
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