Yamaha SRX400 (1987-90)

The Yamaha SRX400 is a four-stroke, single cylinder motorcycle that was manufactured between 1987 and 1990. It has a 399cc engine with a bore and stroke of 87 x 67.2 mm and a compression ratio of 9.2:1. The motorbike is air cooled and has a YDIS twin carburetor induction and TCI ignition. It has a kick start and a maximum power of 33 hp at 7000 rpm and a maximum torque of 3.4 kgf-m at 6000rpm. The transmission is five speed, and the final drive is a chain with a 428 heavy duty O-ring and 138 links. It has a single 320mm disc four piston caliper front brake and a single disc rear brake, with telescopic forks and dual shocks for its rear and front suspension, respectively. The front and the rear tyre sizes 110/70-17 and 140/70-17 both tubeless, respectively. It weighs 147kg and has a fuel capacity of 15 litres or 3.9 US gallons.

Technical specifications:

Make Model: Yamaha SRX 400

Year: 1987 – 90
Engine: Four stroke, single cylinder, SOHC, 4 valves
Capacity: 399 cc / 24.3 cu-in
Bore x Stroke: 87 67.2 mm
Cooling System: Air cooled
Compression Ratio: 9.2:1
Induction: YDIS Twin Carburetor
Ignition: TCI
Spark Plug: DPR8EA-9, IX24B, DPR8EIX
Starting: kick
Max Power: 33 hp / 24.6 kW @ 7000 rpm
Max Torque: 3.4 kgf-m / 24.5 lb-ft @ 6000 rpm
Transmission: 5 Speed
Final Drive: Chain, 428 Heavy Duty O-Ring, 138 links
Sprocket Front / Rear: 17 / 50
Front Suspension: Telescopic forks
Rear Suspension: Dual shocks
Front Brakes: Single 320mm disc 4 piston caliper
Rear Brakes: Single disc
Front Tyre: 110/70-17 Tubeless
Rear Tyre: 140/70-17 Tubeless
Dry Weight: 147 kg / 324 lbs
Fuel Capacity: 15 Liters / 3.9 US gal