Description
| Engine: | DOHC, Inline 4, Air Cooled |
| Displacement: | 652 CC |
| Valves: | 8 Valve (4 Intake / 4 Exhaust) Shim Under-Bucket |
| Valve Clearance, Cold: | 0.08 – 0.18mm (0.003 – 0.007in) |
| Valve Timing: | Inlet: Open: 22° BTDC Closed: 52° ABDC Duration: 250$deg;Outlet: Open: 60° BBCD Closed: 20° ATDC Duration: 260° |
| Bore and Stroke: | 62 X 54mm (2.44 X 2.13in) |
| Compression Ratio: | 9.5:1 |
| Compression Pressure: | 10-14 kg/cm² (155-185 PSI) |
| Max Horsepower: | 64 @ 8,500 RPM |
| Max Torque: | 5.8kg (41.9 ft-lbs) @ 7,000 RPM |
| Cam Chain Type: | Single Roller or Hy/Vo depending on Model |
| Lubrication: | Forced, Twin Rotor Oil Pump |
| Oil Type: | SAE 10W40 (Recommended) |
| Oil Capacity: | Approx. 3.8L |
| Cylinder Numbering: | Left to Right 1-2-3-4 |
| Firing Order: | 1-2-4-3 |
| Idle Speed: | 900 – 1,050 RPM |
Fuel System
| Carburetors: | 4 x Mikuni VM24SS |
| Float Level in Bowl: | 29-31mm |
| Main Jet Size: | 102.5 |
| Pilot Jet Size: | 15 |
| Fuel Capacity: | 16.8L (4.4 US Gallons) |
| Fuel: | Non-leaded Gasoline |
| Fuel Consumption: | Approx. 45 MPG Average |
| Throttle Cable Play: | 2-3mm |
Drive Train / Transmission
| Clutch Type: | Wet, Multi-plate |
| Recommended Clutch Plate Thickness: | 3.7 – 3.9mm |
| Clutch Cable Play: | 2-3mm |
| Gear Box: | 5 Speed Constant Mesh (Manual), Return Shift |
| Gear Ratios: | 1st – 2.33 2nd – 1.63 3rd – 1.27 4th – 1.04 5th – 0.89 |
| Primary Reduction Ratio: | 2.55 |
| Final Reduction Ratio: | 2.56 |
| Overall Drive Ratio: | 5.81 @ Top Gear |
| Primary and Final Drive Type: | Chain / Chain |
| Drive Chain Length: | 102 Links |
| Recommended Chain Tension: | 20-30mm |
| Shift Pattern: | 1-N-2-3-4-5 |
Ignition System
| Starter Type: | Electric, Kick (Kick was eliminated on later models) |
| Ignition Type: | Battery, Coil |
| Pickup Type: | Points, Electronic (Points were changed in favor of Electronic on later models) |
| Spark Plugs: | 4 x NGK B7ES, ND W22ES-U or Champion N4 |
| Spark Plug Gap: | 0.7 – 0.8mm (0.028 – 0-031in) |
| Ignition Timing: | 10° BTDC @ 1,500 RPM 35° BTDC @ 3,200 RPM |
| Breaker Point Gap: | 0.3 – 0.4mm (0.012 – 0.016in) on models so equipped |
Electrics
| Battery: | Yusa YB10L (12V 10AH) |
| Continuous Charge Rate: | 1.0A |
| Headlight: | 12V 50/35W |
| Tail / Brake Light: | 12V 8/27W |
| Turn Signal Lights: | 12V 23W |
| Meter Lights: | 12V 3.4W |
| Neutral Indicator Light: | 12V 3.4W |
| Turn Signal Indicator Lights: | 12V 3.4W |
| High Beam Indicator Light: | 12V 3.4W |
| Oil Pressure Warning Light: | 12V 3.4W |
| Brake Light Failure Indicator Light: | 12V 3.4W |
| Horn: | 12V 2.5A |
| Fuses: | 20A (Main) 10A (Head) 10A (Tail) |
| Alternator: | Nippon Denso 0037000-1340 |
| Regulator / Rectifier: | Shindengen SH221-12 |
| Ignition Coils: | Toyo Denso IGC088K-0000 / IGC089K-0000 |
| Starter Motor: | Mitsuba SM224-D |
Frame & Suspension
| Frame: | Tubular Steel, Double Cradle |
| Front Suspension: | Telescopic Forks |
| Fork Oil Type: | 10W40 or 15W Fork Oil |
| Fork Oil Capacity: | 165cc Each Leg (5.6 oz) |
| Rear Suspension: | Swing Arm, Adjustable Twin Shock |
| Steering Geometry: | 63° Rake / 4.25 in trail |
| Steering Head Angle: | 39.5° |
| Minimum Turning Radius: | 2.4m (94.5 in) |
| Brake Fluid Type: | DOT3, DOT4, DOT5 |
| Front Brake Type: | 245mm Disc |
| Minimum Brake Disc Thickness: | 6mm |
| Rear Brake Type: | 180 x 40mm Drum (Dual Shoe), 245mm Disc (Discs were used on some later models) |
| Braking Distance: | 12m from 50 kph (29.4 ft @ 31 mph) |
| Wheels: | 14 Spoke Alloy |
| Tire Size: | Front: 3.25H-19 4PR Rear: 4.00H-18 4PR |
| Road Clearance: | 145mm (5.7 in) |
| Saddle Height: | 31.9 inches |
| Wheel Base: | 1,420mm (55.9 in) |
| Overall Length: | US: 2,170mm (85.4 in) Europe: 2,220mm |
| Overall Width: | 850mm (33.5 in) |
| Dry Weight: | 211kg (465 lbs) |
| Climbing Angle: | 30° |
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