| Need photo |
Model
Identification |
| Color |
'72 Bright Orange |
| Frame serial # |
F8-09554 - 14549 |
| Engine serial # |
F8E09786 - 14784 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 |
6.8:1 |
| Maximum HP |
23.5 at 6800 rpm |
| Maximum torque |
2.64 kg-m at 6000 rpm |
| Carburetor |
Mikuni VM30SS |
| Lubrication System |
Injectolube (port & crank injection) |
| Transmission |
Ignition System |
Flywheel 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 91 Research/87 average oct, unleaded OK |
| 2nd |
1.71 (24/14) |
Oil |
2-stroke oil for air cooled engines |
| 3rd |
1.17 (21/18) |
Tuning
Specifications |
| 4th |
0.90 (18/20) |
Engine |
| 5th |
0.71 (20/28) |
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 |
12.0 kg/cm² STD 8.4 kg/cm² service limit |
| Overall Ratio (top gear) |
6.98 |
Spark Plug |
NGK B8HCS or B8HS 0.6 - 0.7 mm gap |
| Chassis |
Ignition Timing |
20° BTDC (2.59mm) - Flywheel mark aligns with
crankcase pointer at 11 o'clock position |
| Wheelbase |
1390 mm |
Point Gap |
0.30 - 0.40 mm |
| Ground Clearance |
210 mm |
Air Screw |
1¾ turns out |
| Dry Weight |
123 kg |
Idle Speed |
1200 ± 100 RPM |
| Fuel Tank Capacity |
11.0 liters |
Transmission Oil |
SE Class SAE 10W30 or 10W40 |
| Tire Size |
Front |
3.25-19 4PR Tube-Type |
- Capacity |
1.2 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 |
1.70 kg/cm² cold |
| Rear |
100 mm |
Rear |
2.20 kg/cm² cold (normal) |
| |
Drive Chain Slack |
About 20 mm (on side stand, tightest point, STD) |
