| Need photo |
Model
Identification |
| Color |
Lime Green |
| Frame serial # |
F81-00001 - ? |
| Engine serial # |
F81E00001 - ? found on LH top crankcase below air
intake housing. |
| Cylinder Mark |
246CC found on LH side |
| Engine |
| Engine Type |
2 stroke, single cylinder, rotary disc valve, air
cooled. |
| Displacement |
246cc |
| Bore X Stroke |
68.0 X 68.0 mm |
| Compression Ratio |
7.5:1 |
| Maximum HP |
27 at 6750 rpm |
| Maximum torque |
3.12 kg-m at 5750 rpm |
| Carburetor |
Mikuni VM30SS |
| Lubrication System |
Premix gasoline & oil |
| Transmission |
Ignition System |
Rotor magneto |
| Clutch Type |
Wet, multi-disc, Manual |
Ignition Advance |
Fixed |
| Transmission |
5-speed, constant mesh, return shift |
Crankshaft Rotation |
Counterclockwise from ignition (LH) side |
| Shift Pattern |
1-N-2-3-4-5 bottom up (w/neutral finder) |
Cylinder Material |
Aluminum alloy with ferrous sleeve. |
| Gear ratios |
1st |
2.45 (27/11) |
Fuel |
Min 95 Research/90 average oct, mixed 20:1 gas:oil |
| 2nd |
1.60 (24/15) |
Oil |
2-stroke racing oil for air cooled engines |
| 3rd |
1.26 (24/19) |
Tuning
Specifications |
| 4th |
1.09 (25/23) |
Engine |
| 5th |
0.95 (19/20) |
Cylinder Head Torque |
Nuts |
Cross-tighten : 4.0 kg/m |
| Primary Ratio |
3.04 (73/24) |
Bolts |
Cross-tighten : 2.2 kg/m |
| Final Ratio |
3.21 (45/14) |
Compression Pressure |
13.0 kg/cm² STD 9.0 kg/cm² service limit |
| Overall Ratio (top gear) |
9.29 |
Spark Plug |
NGK B9HCS or B9HS 0.6 mm gap |
| Chassis |
Ignition Timing |
19° BTDC (2.35mm) - Set point gap, install dial
indicator, and turn stator plate to adjust timing. |
| Wheelbase |
1390 mm |
Point Gap |
0.35 ± 0.05 mm |
| Ground Clearance |
230 mm |
Air Screw |
1¼ turns out |
| Dry Weight |
108 kg |
Idle Speed |
Engine stops at closed throttle or lowest stable rpm |
| Fuel Tank Capacity |
12.5 liters |
Transmission Oil |
SE Class SAE 10W30 or 10W40 |
| Tire Size |
Front |
3.00-21 4PR Tube-Type |
- Capacity |
1.0 liter |
| Rear |
4.00-18 4PR Tube-Type |
- Level |
Motorcycle vertical, off side stand, wait 5 min,
between lines on dipstick, screwed in all the way. |
| Brake Type |
Front |
Mechanical Drum (Leading/Trailing) |
Chassis |
| Rear |
Mechanical Drum (Leading/Trailing) |
Fork Oil |
SAE 10W |
| Brake Size |
Front |
150 X 28 mm |
- Capacity |
175 cc dry |
| Rear |
150 X 28 mm |
- Level |
451 ± 4 mm (Fork extended, spring installed) |
| Suspension Stroke |
Front |
175 mm (Hatta fork) |
Tire Pressure |
Front |
1.00 kg/cm² cold, change for course & rider
preference |
| Rear |
100 mm |
Rear |
1.00 kg/cm² cold, change for course & rider
preference |
| |
Drive Chain Slack |
About 25 mm (motorcycle vertical, tightest point,
STD) |
