| Need photo |
Model
Identification |
| Color |
Candy Blue |
| Frame serial # |
S1F-16300 - 24397 |
| Engine serial # |
S1E17100 - 25146 found on RH top crankcase, below carburetor. |
| Cylinder Mark |
249CC found on LH side |
| Engine |
| Engine Type |
2 stroke, 3 cylinder, piston-valve, air cooled. |
| Displacement |
249cc |
| Bore X Stroke |
47.0 X 52.3 mm |
| Compression Ratio |
7.5:1 |
| Maximum HP |
28 at 7500 rpm |
| Maximum torque |
2.7 kg-m at 7000 rpm |
| Carburetor |
Mikuni VM22SC (3) |
| Lubrication System |
Superlube (port injection) |
| Ignition System |
12V battery & coil, contact breaker (3) |
| Ignition Advance |
Fixed |
| Transmission |
Crankshaft Rotation |
Counterclockwise from ignition (LH) side |
| Clutch Type |
Wet, multi-disc, Manual |
Cylinder # method |
Left to right : left - center - right |
| Transmission |
5-speed, constant mesh, return shift |
Firing interval/order |
120°, left - right - center |
| Shift Pattern (Bottom Up) |
1-N-2-3-4-5 (w/neutral finder) |
Cylinder Material |
Aluminum alloy with ferrous sleeve. |
| Gear ratios |
1st |
2.86 (40/14) |
Fuel |
Min 91 Research/87 average oct, unleaded OK |
| 2nd |
1.79 (34/19) |
Oil |
2-stroke oil for air cooled engines |
| 3rd |
1.35 (31/23) |
Tuning
Specifications |
| 4th |
1.12 (28/25) |
Engine |
| 5th |
0.96 (26/27) |
Cylinder Head Torque |
Nuts Cross-tighten : 2.2 kg/m |
| Primary Ratio |
2.22 (60/27) |
Compression Pressure |
12.0 kg/cm² STD 8.4 kg/cm² service limit |
| Final Ratio |
3.43 (48/14) |
Spark Plug |
NGK B9HCS or B9HS 0.6 - 0.7 mm gap |
| Overall Ratio (top gear) |
7.31 |
Point Gap |
0.35 ± 0.05 mm |
| Chassis |
Ignition Timing |
23° BTDC (2.60mm) - "L" or "C"
or "R" mark aligns with mark in stator window. |
| Wheelbase |
1375 mm |
Air Screw |
1½ turns out |
| Ground Clearance |
150 mm |
Idle Speed |
1250 ± 50 RPM |
| Seat Height |
800 mm |
Transmission Oil |
SE Class SAE 10W30 or 10W40 |
| Dry Weight |
155 kg |
- Capacity |
1.1 liter |
| Fuel Tank Capacity |
14.0 liter |
- Level |
On center stand, wait 5 min, between lines on
dipstick, screwed all the way in. |
| Tire Size |
Front |
3.00S-18 4PR Tube-Type |
Chassis |
| Rear |
3.50S-18 4PR Tube-Type |
Fork Oil |
SAE 10W |
| Brake Type |
Front |
Mechanical Drum (Two Leading) |
- Capacity |
210 cc dry |
| Rear |
Mechanical Drum (Leading/Trailing) |
- Level |
375 ± 4 mm (Fork extended, spring installed) |
| Brake Size |
Front |
180 X 30 mm |
Tire Pressure |
Front |
1.70 kg/cm² cold |
| Rear |
180 X 30 mm |
Rear |
2.20 kg/cm² cold (normal) |
| Suspension Stroke |
Front |
110 mm |
Drive Chain Slack |
20 - 25 mm (on center stand, tightest point, STD) |
| Rear |
70 mm |
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