| Need photo |
Model
Identification |
| Color |
Vivid Yellow |
| Frame serial # |
G4-083000 - 091604 |
| Engine serial # |
G4E077300 - 085908 found on LH top crankcase below
air intake duct. |
| Cylinder Mark |
99CC found on LH side |
| Engine |
| Engine Type |
2 stroke, single cylinder, rotary disc valve, air
cooled. |
| Displacement |
99cc |
| Bore X Stroke |
49.5 X 51.8 mm |
| Compression Ratio |
7.0:1 |
| Maximum HP |
11 at 7500 rpm |
| Maximum torque |
1.1 kg-m at 7000 rpm |
| Carburetor |
Mikuni VM19SC |
| Lubrication System |
Superlube (port injection) |
| Transmission |
Ignition System |
Flywheel magneto |
| Clutch Type |
Wet, multi-disc, Manual |
Ignition Advance |
Fixed |
| Transmission |
5-speed, constant mesh, return shift
(with 2-speed sub transmission, quick change by handlebar
lever) |
Crankshaft Rotation |
Counterclockwise from ignition (LH) side |
| Shift Pattern |
N-1-2-3-4-5 bottom up |
Cylinder Material |
Aluminum alloy with ferrous sleeve |
| Gear ratios |
High Range |
Low Range |
Fuel |
Min 91 Research/87 avg oct, unleaded OK |
| |
1st |
2.92 (35/12) |
5.43 |
Oil |
2-stroke oil for air cooled engines |
| 2nd |
1.76 (30/17) |
3.27 |
Tuning
Specifications |
| 3rd |
1.30 (26/20) |
2.42 |
Engine |
| 4th |
1.09 (24/22) |
2.02 |
Cylinder Head Torque Nuts |
Cross-tighten: 2.2 kg-m |
| 5th |
0.96 (23/24) |
1.79 |
Compression Pressure |
9.8 kg/cm² STD 6.9 kg/cm² service limit |
| Primary Ratio |
3.52 (74/21) |
Spark Plug |
NGK B7HS 0.6 - 0.7 mm gap |
| Sub transmission Ratios |
1.00 |
1.86 (20/20 x 26/14) |
Ignition Timing |
20° BTDC (1.96mm) - Remove cap, Flywheel mark aligns
with crankcase mark at 12 o'clock position |
| Final Ratio |
2.80 (42/15) |
5.20 (1.86 x 2.80) |
Point Gap |
0.30 - 0.40 mm |
| Overall Ratio (Top Gear) |
9.46 |
17.57 |
Air Screw |
1½ turns out |
| Chassis |
Idle Speed |
Lowest stable RPM (usually 1350 ± 50 RPM) |
| Wheelbase |
1258 mm |
Transmission Oil |
SE Class SAE 10W30 or 10W40 |
| Seat Height |
800 mm |
- Capacity |
0.6 liter |
| Ground Clearance |
225 mm |
- Level |
Motorcycle vertical, off side stand, wait 5 min, just
runs out of level screw hole |
| Dry Weight |
95 kg |
Sub transmission Oil |
Same as transmission oil |
| Fuel Tank Capacity |
8.3 liters |
- Capacity |
.1 liter |
| Tire Size |
Front |
3.00-18 4PR Tube-Type |
- Level |
Motorcycle vertical, off side stand, just runs out of
level screw hole |
| Rear |
3.00-18 4PR Tube-Type |
Chassis |
| Brake Type |
Front |
Mechanical Drum (Leading/Trailing) |
Fork Oil |
SAE 10W |
| Rear |
Mechanical Drum (Leading/Trailing) |
- Capacity |
174 cc dry |
| Brake Size |
Front |
110 X 30 mm |
- Level |
395 ± 4 mm (Fork extended, spring installed) |
| Rear |
110 X 30 mm |
Tire Pressure |
Front |
1.60 kg/cm² cold |
| Suspension Stroke |
Front |
145 mm |
Rear |
2.00 kg/cm² cold |
| Rear |
90 mm |
Drive Chain Slack |
15 - 20 mm (on side stand, tightest point, STD) |
