650G (Maxim)
Engine Removal
ENGINE REMOVAL
NOTE:
It is not necessary to remove the engine in order to remove the cylinder head, cylinder, or pistons.
A . Preparation for Removal
1 All dirt, mud, dust and foreign material should be thoroughly removed from the exterior of the engine before removal and disassembly. This will help prevent any harmful foreign material from getting into the engine oil.
Clutch and Shifter Reassembly
5. Clutch assembly
a. Install the thrust plate onto the transmission main axle.
1. Thrust plate
b. Install the oil pump drive sprocket onto the main axle without the spacer collar and place the oil pump drive chain on its sprocket.
1. Oil pump drive sprocket
Lower Crankcase Reassembly
2. Lower crankcase
a. Install the shift cam and secure it with the guide pin. Install the stopper plate and bolt and tighten securely.
b. Install the neutral switch.
c. Install the transmission drive axle assembly into the crankcase.
Pistons and Cylinder Reassembly
11. Pistons and Cylinder a. Install the pistons on the rods. The arrow on the piston must point to the front of the engine.
NOTE:--------------------------------------------------------
Before installing the piston pin clips, cover
the crankcase with a clean rag so you will
not accidentally drop the circlip into the
crankcase.
Cylinder Head and Camshaft Reassembly
12. Cylinder head and Cam shafts
a. Install the new cylinder head gasket. Install the dowel pins and "O-rings". Locate the cam chain cavity cylinder seal with the tabs down.
b. Install the cylinder head onto the cylinder. Pull the cam chain through the cylinder head as it is installed. Tie the cam chain so that it does not fall into the crankcase.
Generator, Starter and Pick-up Coil Reassembly
8. A.C. Generator
a. Install the rotor onto the shaft and
tighten the bolt using the rotor holding
tool (special tool) as shown.
1. Rotor holding tool
Tightening torque: 5.5 m-kg (39.8 ft-lb)
Upper Crankcase Reassembly
ENGINE ASSEMBLY AND ADJUSTMENT
A. Important Information
1. Gasket and seal
All gaskets and seals should be replaced when an engine is overhauled. All gasket surfaces and oil seal lips must be cleaned.
2. Properly oil all mating engine and transmission parts and bearings during reassembly.
3. Circlip
Middle Gear -- Inspection and Repair
P. Middle Gear
1. Damper disassembly
NOTE:-------------------------------------------------------
Disassembly of the middle gear damper requires the damper compressor (special tool) and a hydraulic press.
a. Place the middle drive shaft in a press with the damper compressor (special tool) in place as shown.