Examination
Caution: When reassembling the primary rocker arm, carefully apply pressurized air to the rocker arm lube port.
1. Check the rocker piston. Press the piston with your finger; if the piston does not move freely, replace the rocker arm assembly.
2. Remove the freewheel assembly from the cylinder head and check its operation by pressing the plunger with your finger. If the freewheel assembly does not move freely, replace it.
Checking the gap
Measure both axes of the intake and exhaust valve rocker arms.
1. Measure the axle diameter at the rocker arm location of the first valve.
2. Set the bore gauge to zero.
3. Measure the inside diameter of the rocker arm and check for out-of-roundness.
Gap ''rocker arm - rocker arm axis":
Inlet and outlet
- Nominal value (new): 0.025 - 0.052 mm
- Limit value: 0.08 mm
Repeat the check for the remaining rocker arms.
Replace the rocker shaft and any rocker arms that exceed the clearance limit.
Attention: If any rocker arm is removed from the assembly (primary, secondary or secondary) needs replacement, replace all three rocker arms assemblies.