Table of Contents
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1. OESCRIPTION
Engine type
51 Compression ratio
61 Starting system.
7) Ignition system
2. CYLINDER HEAD
1
Combustion chamber volume (with N-7Yl
3. CYLINDER
1 I Material
Piston skirt clearance
21 Piston oversize
5. PISTON RING
Piston ring design
21 Ring end gap
6. BIG END BEARING
2) Bearing size
31 Needle size
7. CAMSHAFT
1 I Cam drive type
21 Number and type of bearing
41 Cam dimensions
Air cooled, 4.stroke. SOHC twin,
parallel forward incline
653 cc (39.85 cu.in)
75 x 74 mm (2.953 x 2.913 in)
8.5
Kick and electric starter
Battery ignition
wet sump
43.6 cc (2.660 win)
Dome + Squish
1.2 mm (0.047 in)
Aluminum alloy with cast iron sleeve
0.01 mm (0.0004 in)
0.050 - 0.055 mm ~0.0020 - 0.0022 in)
7 5 . 2 5 mm 75.50 mm 75.75 ml-n 76.00 m m
20.0 _;,, mm x 61 .o -:.a mm
IO.79 &,,,, in x 2.40 -&II 16 j")
1.2 mm 10.047 in) 1.5 mm 10.059 in, 2.8 mm 10.110 II
0.2 - 0.4 mm (0.008 - 0.016 in)
0.2 - 0.4 mm (0.008 - 0.016 in)
(Installed. oil)
0.3 - 0.9 mm (0.012 - 0.035 in1
(Top)
0.04 - 0.08 mm (0.0016 - 0.0031 in)
0.03 - 0.07 mm (0.0012 - 0.0028 in)
Needle bearing
Chain (Center side)
4 bearings, Ball bearings (6W5)
i n )
i n ,
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