1983 Kawasaki KDX250
Specifications and workshop reference information for the 1983 Kawasaki KDX250, including engine, chassis, service data and setup details.
Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.
General Specifications
| Engine Type | 2-stroke, single-cylinder, piston reed valve, air-cooled |
| Displacement | 249 cc |
| Bore × Stroke | 70.0 × 64.9 mm |
| Compression Ratio | 8.2:1 |
| Carburetor | Mikuni VM36SS |
| Fuel Type | Petrol mix (30:1) |
| Lubrication | Premix |
| Starting System | Primary kick |
| Ignition | CDI system |
| Ignition Timing | 17° BTDC @ 6000 rpm (1.79 mm) |
| Spark Plug | NGK B8ES (C) / NGK BR8ES |
| Headlight | 6V 25W |
| Taillight | 6V 5.3W |
Port Timing
| Inlet Open | — |
| Scavenging Open | 62° BBDC |
| Scavenging Close | 62° ABDC |
| Exhaust Open | 91.5° BBDC |
| Exhaust Close | 91.5° ABDC |
Transmission
| Transmission Type | 6-speed constant mesh, return shift |
| Clutch | Wet, multi-disc |
| Final Drive Type | Chain drive |
| 1st Gear | 2.583 (31/12) |
| 2nd Gear | 1.800 (27/15) |
| 3rd Gear | 1.350 (27/20) |
| 4th Gear | 1.100 (22/20) |
| 5th Gear | 0.909 (20/22) |
| 6th Gear | 0.777 (21/27) |
| Primary Reduction | 2.500 (50/20) |
| Final Reduction | 3.714 (52/14) |
| Overall Drive Ratio | 7.222 (Top gear) |
| Transmission Oil Capacity | 0.9 L (1.0 US qt) |
| Transmission Oil Type | SE class SAE 10W30 or 10W40 |
Dimensions
| Overall Length | 2175 mm (85.63 in) |
| Overall Width | 830 mm (32.68 in) |
| Overall Height | 1185 mm (46.65 in) |
| Wheelbase | 1475 mm (58.07 in) |
| Ground Clearance | 340 mm (13.39 in) |
| Dry Weight | 103 kg (231 lb) |
| Fuel Tank Capacity | 12.5 L (3.3 US gal) |
Chassis
| Frame Type | Tubular, single down tube |
| Steering Angle | 45° |
| Caster | 29° |
| Trail | 127 mm (5.00 in) |
| Front Tire | 3.00-21 4PR |
| Rear Tire | 5.10-18 4PR |
Suspension
| Front | Telescopic fork (Air fork) |
| Rear | Swing arm (Uni-trak) |
| Front Suspension Travel | 260 mm (10.24 in) |
| Rear Wheel Travel | 270 mm (10.63 in) |
| Fork Oil Type | KYB G-10 or SAE 10 |
| Fork Oil Capacity | 457–465 mL (15.45–15.72 US oz) |
Brakes & Wheels
| Front Brake | Drum brake |
| Rear Brake | Drum brake |
| Front Drum Size | 140 × 28 mm (5.5 × 1.18 in) |
| Rear Drum Size | 130 × 28 mm (5.1 × 1.18 in) |
250cc Other Specs
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