GB
5
Power Unit
1. Special tools ………………………… 5-2
2. Parts Layout ………………………… 5-4
Engine …………………………………… 5-4
Recoil Starter …………………………… 5-6
Magneto • Electric Parts ………………… 5-8
Intake Manifold…………………………… 5-12
Cylinder Crank Case …………………… 5-14
Piston & Crank Shaft …………………… 5-20
3. Inspection Items …………………… 5-22
1) Removing Power Unit ……………… 5-22
2) Removing Recoil Starter…………… 5-24
3) Removing Flywheel ………………… 5-26
4) Removing Electric Parts …………… 5-26
5) Inspection of Magneto Basement … 5-30
6) Removing Advancer Arm ………… 5-30
7) Removing Intake Silencer and
Carburetors ………………………… 5-30
8)
Removing Oil Recirculation Hoses
… 5-32
9) Removing Intake Manifold and
Reed valves ………………………… 5-34
10) Inspection of Reed Valve Assy …… 5-34
11) Removing Thermostat Inspection of
Thermostat ………………………… 5-36
12) Removing Cylinder Head ………… 5-38
13) Inspection of Cylinder Head ……… 5-40
14) Removing Exhaust Cover ………… 5-42
15) Inspection of Exhaust Cover ……… 5-44
16) Removing Crank Case …………… 5-44
17) Inspection of Crank Case Head…… 5-46
18) Removing Pistons ………………… 5-46
19) Disassembly of Crank Shaft ……… 5-48
20) Inspection of Crank Shaft ………… 5-50
21) Inspection of Engine Parts ………… 5-52
22) Inspection of Pistons ……………… 5-54
23 )Assembling Crank Shaft ………… 5-58
24) Installing Needle Bearing and
Pistons ……………………………… 5-60
25) Assembling Power Unit Parts …… 5-66
26) Assembling Crank Ass'y and
Crank Case ………………………… 5-68
27) Assembling Exhaust Cover Parts … 5-70
28) Assembling Cylinder Head Parts … 5-72
29) Installing Reed Valve and
Intake Manifold ……………………… 5-72
30) Attaching Recirculation Hoses …… 5-74
31) Installing Carburetor and
Intake Silencer ……………………… 5-74
32) Installing Advancer Arm …………… 5-76
33) Installing Electric Parts …………… 5-78
34) Installing Flywheel ………………… 5-78
35) Installing Power Unit ……………… 5-80
36) Disassembly of Recoil Starter …… 5-82
37) Inspection of Recoil Starter ……… 5-82
38) Assembling of Recoil Starter ……… 5-84
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