5
5
Power Unit
1. Special tools ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-2
2. Parts Layout⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-3
Engine ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-3
Magneto ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-4
Electric Parts ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-5
Intake Manifold & Fuel Pump⋯⋯⋯⋯⋯⋯⋯ 5-6
Camshaft & Oil Pump ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-7
Cylinder Head ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-8
Intake Valve & Exhaust Valve ⋯⋯⋯⋯⋯⋯ 5-9
Cylinder ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-10
Piston & Crankshaft ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-11
Recoil Starter ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-12
Top Cowl⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-13
3. Inspection Items ⋯⋯⋯⋯⋯⋯⋯⋯ 5-14
1) Inspection of Comperession Pressure 5-14
2) Inspection of Oil Pressure ⋯⋯⋯⋯⋯⋯ 5-15
3) Inspection of Valve Clearance ⋯⋯⋯⋯ 5-16
4) Removing Power Unit ⋯⋯⋯⋯⋯⋯⋯ 5-18
5) Removing Plunger and Oil Starter ⋯⋯ 5-20
6) Inspection of Oil Strainer ⋯⋯⋯⋯⋯⋯ 5-20
7) Flywheel and Electrical Components ⋯ 5-20
8) Removing Timing Belt and Pulley ⋯⋯ 5-22
9) Inspection of Timing Belt ⋯⋯⋯⋯⋯⋯ 5-23
10) Installation of Pulley and Timing Belt ⋯ 5-24
11) Removing Cylinder Head ⋯⋯⋯⋯⋯⋯ 5-27
12) Inspection of Valve Spring ⋯⋯⋯⋯⋯ 5-29
13) Inspection of Valve⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-30
14) Inspection of Valve Guide ⋯⋯⋯⋯⋯⋯ 5-30
15) Inspection of Valve Seat ⋯⋯⋯⋯⋯⋯ 5-31
16) Correction of Valve Seat ⋯⋯⋯⋯⋯⋯ 5-32
17) Inspection of Locker Arm and Rocker
Arm Shaft⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-34
18) Inspection of Cam Shaft ⋯⋯⋯⋯⋯⋯ 5-35
19) Inspection of Cylinder Head ⋯⋯⋯⋯⋯ 5-36
20) Inspection of Oil Pump ⋯⋯⋯⋯⋯⋯⋯ 5-37
21) Installation of Valves ⋯⋯⋯⋯⋯⋯⋯⋯ 5-38
22) Installation of Cam Shaft ⋯⋯⋯⋯⋯⋯ 5-39
23) Installation of Rocker Arm Shaft ⋯⋯⋯ 5-39
24) Installation of Oil Pump ⋯⋯⋯⋯⋯⋯⋯ 5-40
25) Installation of Cylinder Head⋯⋯⋯⋯⋯ 5-41
26) Disassembly of Cylinder Block ⋯⋯⋯⋯ 5-42
27) Inspection of Piston Outer Diameter ⋯ 5-43
28) Inspection of Cylinder Inner Diameter⋯ 5-43
29) Inspection of Piston Clearance ⋯⋯⋯ 5-44
30)
Inspection of Piston Ring Side Clearance
⋯ 5-44
31) Inspection of Piston Rings ⋯⋯⋯⋯⋯ 5-44
32) Inspection of Piston Pins ⋯⋯⋯⋯⋯⋯ 5-45
33) Inspection of Connecting Rod Small
End Inner Diameter ⋯⋯⋯⋯⋯⋯⋯⋯ 5-45
34) Inspection of Connecting Rod Big End
Side Clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-45
35) Inspection of Crank Shaft ⋯⋯⋯⋯⋯⋯ 5-46
36) Inspection of Crank Pin Oil Clearance 5-47
37) Crankshaft Main Journal Oil Inspection
of Clearance ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-48
38)
Inner Diameter of Cylinder/Crank Case
Bearing Holder (Inner Diameter Code)
⋯ 5-49
39) Thickness of Metal Bearing
(Color of Inner Diameter Code) ⋯⋯⋯ 5-49
40)
Assembling Piston and Connecting Rod
⋯ 5-50
41) Installation of Timing Belt ⋯⋯⋯⋯⋯⋯ 5-54
42) Installation of Starter Motor ⋯⋯⋯⋯⋯ 5-57
43) Installing Intake Manifold ⋯⋯⋯⋯⋯⋯ 5-59
44) Installing Flywheel ⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5-62
45) Installation of Power Unit ⋯⋯⋯⋯⋯⋯ 5-63
46) Removing Recoil Starter ⋯⋯⋯⋯⋯⋯ 5-63
47) Disassembly of Recoil Starter ⋯⋯⋯ 5-64
48) Inspection of Recoil Starter ⋯⋯⋯⋯⋯ 5-65
49) Installation of Recoil Starter ⋯⋯⋯⋯⋯ 5-66
E_MFS20C_ch05_090105.qxd 09.1.20 5:25 PM ページ 1
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