General
To simplify reassembly and wiring installation, lay out the various screws and clamps in the order of their proper location.
Remove the electric starter. Refer to Starter Removal on p. 144.
Remove the oil tank. Refer to Oil Tank Assembly on p. 187.
Remove fuel pump assemblies, fuel manifolds, and filter. Refer to FUEL COMPONENT SERVICING on p. 166.
Remove EMM and electrical harness assembly. Refer to EMM SERVICING on p. 102.
Remove flywheel and stator. Refer to FLYWHEEL AND STATOR SERVICING on p. 139.
Remove ignition coils and fuel injectors. Refer to Fuel Injector Service on p. 169.
IMPORTANT: Mark injectors for cylinder location before removal. All injectors must be installed in their original location. Improper injector installation can result in powerhead failure.
Remove throttle linkage. Refer to Throttle Linkage Removal on p. 204.
Remove shift linkage. Refer to Shift Linkage Removal on p. 204.
Remove the throttle body and reed plate assemblies. Refer to Intake Manifold Service on p. 172. Remove pressure valve assembly. Refer to PRESSURE RELIEF VALVE SERVICING on p. 197.
Throttle Linkage Removal
Remove throttle cam and throttle lever.
- Throttle lever screw
- Throttle return lever
Shift Linkage Removal
Remove shoulder screw from shift arm and retaining screw from shift rod lever. Remove the cotter pin and washer holding the shift shaft.
- Shift lever screw
- Shift rod lever screw
- Cotter pin
Slide entire shift linkage assembly from crank case.
- Shift detent assembly
Crankcase Disassembly
Remove screws and exhaust side water cover.
Wear safety glasses to avoid injury.
Use a 1/8 in. diameter pin punch to push crankcase taper pin toward the front side of the engine.
Remove crankcase flange screws.
Loosen in stages and remove the main bearing nuts and washers.
Separate crankcase and cylinder block. It may be necessary to tap on crankshaft with a rawhide or rubber mallet to loosen.
Cylinder Head Removal
Remove thermostat cover and thermostat assembly. Refer to THERMOSTAT SERVICING on p. 196.
Loosen in stages and remove cylinder head retaining screws. Remove the cylinder head. Dis card thermostat seal and O-rings.
- Cylinder head screws (14 total)
Connecting Rods and Pistons
Use a permanent marker to identify each connecting rod cap, connecting rod, and piston by cylinder number. Number 1 is closest to the flywheel.
Use Torquing Socket, P/N 331638, to loosen in stages the rod cap retaining screws. DO NOT remove the screws.
Use one hand to support the piston, and remove the rod cap screws with your other hand. Remove each piston and rod assembly.
IMPORTANT: Reattach each rod cap to its rod as soon as the piston is removed. Each cap is unique and can only be installed on its mated rod. Do not allow rod to contact inside surface of cylinder or crankshaft.
IMPORTANT: Identify all internal components so that if reused, they can be reinstalled in their original positions.
Repeat steps for each remaining piston and connecting rod.
Use an appropriate ring expander to remove all piston rings from pistons. Discard the rings.
Wear safety glasses to avoid injury.
Remove wrist pin retaining rings. Discard retaining rings.
The wrist pin fit is loose on both sides. Push the wrist pin through to free the piston from the connecting rod. If necessary, use Wrist Pin Pressing Tool, P/N 326356, to remove the wrist pin bearing.
Be careful not to lose any of the 28 needle bearings or the two wrist pin washers. If any of the bearings are worn or lost, replace all 28 bearings during reassembly.
Crankshaft Removal
Carefully lift crankshaft straight up and remove from crankcase.
Remove upper seal from crankshaft. Discard the seal. A new upper seal must be installed on assembly.
Remove the upper main bearing.
- Upper oil seal
- Upper main bearing
Remove the lower bearing seal housing.
Remove the housing O-ring. Discard O-ring.
Use a punch to remove the housing seal. Discard seal.
- Punch
Inspect housing and replace if necessary.
Remove O-ring from crankshaft sleeve and inspect it. Replace the O-ring if it is not in good condition.
Inspect the crankshaft sleeve and replace if necessary. To remove the sleeve, use Slide Hammer, P/N 432128, and Large Puller Jaws, P/N 432129.
Remove the lower main bearing only if it needs to be replaced. Use external retaining ring pliers to remove the lower bearing retaining ring.
IMPORTANT: If the lower main bearing is removed from the crankshaft, it must be discarded. DO NOT reuse it.
Use a bearing separator to support the bearing, and press off the crankshaft.
Remove center main bearings and split sleeves for inspection. DO not mix parts. Note location of bearings for reassembly.
