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Model
Identification |
| Color |
1- Halibut Red 2- Halibut Blue |
| Frame number range |
K4-000001 - 013799 |
| Engine number range |
K4E000001 - 013883, found on LH top crankcase, below
carburetor. |
| Cylinder Mark |
398cc found on front center, below tensioner |
| Engine |
| Engine Type |
4 stroke, 2 - cylinder, SOHC, air cooled, counter balancer |
| Displacement |
398cc |
| Bore X Stroke |
64.0 X 62.0 mm |
| Compression Ratio |
9.0:1 |
| Maximum HP |
35 at 8500 rpm |
| Maximum torque |
3.17 kg-m at 7500 rpm |
| Carburetor |
Keihin CV36SS (2), constant velocity, piston type |
| Ignition System |
12 Battery & coil, contact breaker |
| Ignition Advance |
Mechanical (centrifugal) |
| Transmission |
Crankshaft Rotation |
Counterclockwise from ignition (RH) side |
| Clutch Type |
Wet, multi-disc, Manual |
Firing Interval |
360° |
| Transmission |
5-speed, constant mesh, return shift |
Cylinder Material |
Aluminum alloy with ferrous sleeve |
| Shift Pattern (bottom Up) |
1-N-2-3-4-5 |
Fuel |
Min 91 Research/87 average oct, unleaded OK |
| Gear ratios |
1st |
2.57 (36/14) |
Tuning
Specifications |
| 2nd |
1.68 (32/19) |
Engine |
| 3rd |
1.27 (28/22) |
Cylinder Head Torque |
Nuts |
In sequence 1- 1.5 kg/m 2- 2.8 kg/m |
| 4th |
1.04 (26/25) |
Bolts |
3- 1.2 kg/m 4- Warm up 5- Retorque cold |
| 5th |
0.89 (24/27) |
Valve Clearance Cold |
Intake |
0.10 - 0.15 mm |
| Primary Ratio |
2.43 (56/23) |
Exhaust |
0.10 - 0.15 mm |
| Final Ratio |
3.00 (45/15) |
Valve Adjustment Method |
Eccentric rocker arm shaft |
| Overall Ratio (Top Gear) |
6.49 |
Compression Pressure |
10.0 - 11.0 kg/cm² STD 7.5 kg/cm² service limit |
| Chassis |
Spark Plug |
NGK B8ES or ND W24ES-U 0.7 - 0.8 mm gap |
| Wheelbase |
1360 mm |
Point Gap |
0.35 ± 0.05 mm |
| Seat Height |
830 mm |
Ignition Timing |
Idle |
15° BTDC ("F" mark) at 1,200 rpm |
| Ground Clearance |
125 mm |
Full |
40° BTDC (in double marks) at 3,000 rpm |
| Dry Weight |
170 kg |
Pilot Screw (turns out) |
7/8 (Carb marked with 746A or B ro C) 1½ (Carb marked
with 746D) |
| Fuel Tank Capacity |
14.0 liter |
Idle Speed |
1200 ± 100 rpm |
| Engine Oil |
SEClassSAE10W40,10W50, 20W40,20W50 |
| Tire Size |
Front |
3.25S-18 4PR Tube-Type |
- w/filter change |
3.0 liter |
| Rear |
3.50-18 6PR Tube-Type |
- no filter change |
2.6 liter |
| Brake Type |
Front |
Single hydraulic disc |
- Level |
Motorcycle vertical, wait 5 min, middle of window. |
| Rear |
Mechanical Drum (Leading/Trailing) |
- Pressure (Hot) |
More than 2.0 kg/cm² at 4,000 rpm, 90° C |
| Brake Size |
Front |
277 mm disc diameter |
Chassis |
| Rear |
180 X 30 mm |
Fork Oil |
SAE 5W20 |
| Suspension Stroke |
Front |
135 mm |
- Capacity |
160cc dry |
| Rear |
80 mm |
- Level |
350 ± 4 (Fork extended, spring installed) |
| |
Tire Pressure (cold) |
Front |
1.90 kg/cm² |
| Rear (normal) |
2.00 kg/cm² (0 - 97.5 kg) |
| Rear (heavy) |
2.40 kg/cm² (Over 97.5 kg) |
| Drive Chain Slack |
20 - 25 mm (on center stand, tightest point, STD) |
