For piston replacement Instructions, refer to para 5-11.
Inspect studs (1 and 2). Replace the studs if damaged.
Inspect push rod O-ring (3). Replace the O-ring if damaged.
Inspect cylinder head gasket (4). Replace gasket if damaged.
Inspect oil drain plug (5) and drain plug washer seal (6).
Inspect oil drain hose (7), fittings (8 and 9), and fitting seal (10).
Inspect crankshaft seal for damage.
Check that cylinder sleeve ID is greater than 2.684 inches (68.16 mm). Re-bore the cylinder sleeve if it
exceeds the wear limit and use with an oversized piston [0.0098 inch (0.25 mm)].
Unscrew any damaged studs (1 or 2) and insert new studs.
Discard push rod O-ring (3) and replace with new O-ring.
Discard cylinder head gasket (4) and replace with new gasket.
Replace damaged oil drain plug (5) or drain plug seal (6).
Replace oil drain hose (7), fittings (8 and 9), or fitting seal (10) if damaged.
Remove crankshaft oil seal if damaged and insert new seal using crank shaft crankcase oil seal fitting
Replace governor shaft needle bearing (11) by removing bearing with mechanical bearing puller. Insert
new needle bearing into hole in crankcase.
Remove bad camshaft needle bearing (13) or bad balancer shaft ball bearing using mechanical bearing
puller. Insert new camshaft needle bearing or balancer shaft ball bearing into crankcase.