Valve Springs - Honda GX 120 Tech Manual

Remove valves:

VALVE SPRINGS

Valve springs will be stock Honda springs and will not be altered in any way.
A. Wire diameter: 0.071" maximum
B. Outside diameter of spring: 0.790" maximum
C. Number of total coils: 5.3
D. Spring pressure: 12 LBS maximum at 13/16" (0.812")
E. Stacked length will be: 0.394" maximum
ROCKER ARMS - PUSH RODS - STUDS
Rocker arms will be stock Honda and will not be altered in any way. Rocker arm studs will be stock
Honda. They or their mounting position may not be altered in any manner. No heli-coiling of mounting
holes. No bending of studs. Push rods will be stock Honda and will not be altered in any way. Push rod
length will be Maximum 4.799"- 4.770".
Retainer:
A. Inspect retainers for alteration that would increase valve spring pressure. Both intake and
exhaust must have stock Honda retainers.
corresponding retainer.
B. Thickness of retainer will be:
Intake: 0.228" minimum
Exhaust: 0.241" minimum
C. Flange thickness of retainer will be:
Intake: 0.110" maximum
Exhaust: 0.070" maximum
D. From flat of flange to machined surface:
Intake: 0.148" minimum
Exhaust: 0.165" minimum
E. All Valve oil seals must be removed.
1. The use of valve seals is illegal and will result in applicable suspension per Honda
suspension program.
Exhaust valve only can have lash cap and
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