Opening the crankcase
Remove the engine from the frame (Removing the engine).
Remove the timing outer covers (Removing the timing outer covers).
Remove the timing belts (Removing the tensioner pulley/timing belt).
Remove the timing belt pulleys (Disassembling the camshaft pulleys).
Remove the complete cylinder head unit (Removing the engine heads).
Remove the cylinder/piston assembly (Removing the cylinder/piston assembly).
Remove the generator side cover (Removing the generator cover) and the complete generator (Removing the flywheel/generator unit).
Remove the starter motor (Removing the starter motor).
Remove the clutch cover (Removing the clutch cover).
Remove the clutch unit (Removing the clutch).
Remove the oil pump (Removing the oil pump).
Remove the primary drive gear (Removing the primary drive gear).
Remove the mesh filter (Changing engine oil and filter cartridge).
Loosen jointing screws (1), (2) and (3) on generator-side crankcase half.
Loosen jointing screws (1) on clutch-side crankcase half, near the vertical cylinder seat
Reuse the generator cover or a service cover with puller (A) part no. 88713.1749 fitted.
Secure cover to crankcase half with some of the original screws and begin separation by turning the central pin of the tool.
Tap the end of the gearbox secondary shaft with a plastic mallet to separate the crankcase halves.
Note
Take care not to lose the shim washers on the shafts and on the selector drum.
Remove gearbox shafts (4) and gear selector drum (5) from the crankcase halves .
Drive out the crankshaft (6) using a plastic mallet, taking care not to lose the single shim washer (7) positioned on clutch side, only.
Remove the timing layshaft (8).
Remove the O-ring (9) on the oilway connecting the two crankcase halves.
If necessary, remove screws (10), jets (11) and collect the O-rings.