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RC Valve
Exhaust Valve/Cylinder Decarbonizing
1. Remove the carbon deposits from the valve
shaft assembly (1), RC valve (2), cylinder port
and cylinder cover.
Decarbonize the valve shaft assembly, RC valve
cylinder port and cylinder cover every 3 races.
2. Inspect the RC valve, valve shaft assembly for
wear or damage.
(1)
(1) valve shaft assembly
(2)
(2) RC valve
56
Servicing Your Honda
Valve Shaft Oil Seal Inspection
Check the valve shaft oil seal (1) for wear or
damage.
Replace the oil seal, if necessary.
(1)
(1) valve shaft oil seal
Exhaust Valve Assembly
1. Clean any gasket material from the mating
surfaces of the cylinder and cylinder cover.
2. Apply a thin coat of molybdenum disulfide oil
to the hole of RC valve and valve shaft.
3. Apply silicone sealer (Three Bond 1207B or
equivalent) (1) to the mating surface of the
cylinder as shown.
(1)
(1) silicone sealer
4. For ease of RC valve installation, place the
cylinder upside down. Set the RC valve (2)
onto the cylinder cover (3) and O-rings (4) to
the cylinder.
(3)
(2)
(4)
(2) RC valve
(4) O-rings
(3) cylinder cover
5. Install the cylinder cover carefully to the
cylinder.
6. Install the valve shaft assembly. Make sure
that the valve shaft and RC valve are aligned.
7. Tighten the bolts A (5) and bolts B (6) to the
specified torque:
9 lbf·ft (12 N·m, 1.2 kgf·m)
(5)
(5) bolts A
(6) bolts B
(6)
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