Yamaha SRX 400 (1985-86) vs Norton Superlight SS (2020)
Comparison technical specifications
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| Make: | Yamaha | Norton |
| Model: | SRX 400 | Superlight SS |
| Years: | 1985-86 | 2020 |
| Engine: | Four stroke, single cylinder, SOHC, 4 valves | Four stroke, parallel twin, 270 degree firing order, chain driven DOHC, with idler gear |
| Capacity: | 399 cc / 24.3 cu-in | 650 cc / 39.6 cu-in |
| Bore x Stroke: | 87 х 67.2 mm | 82 x 61.5mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 9.0:1 |
| Induction: | YDIS Twin Carburetor | Electronic fuel injection system |
| Ignition: | TCI | Keyless ignition system |
| Starting: | Kick | Electric |
| Max Power: | 33 hp / 24.6 kW @ 7000 rpm | 175 hp / 130.4 kW @ 12500 rpm |
| Max Torque: | 3.4 kgf-m / 24.5 lb-ft @ 6000 rpm | 125 Nm / 92 lb-ft |
| Final Drive: | Chain, 428 Heavy Duty O-Ring, 138 links | Chain |
| Front Suspension: | Telescopic forks | Öhlins NIX30 system front fork, fully adjustable |
| Rear Suspension: | Dual shocks | Öhlins TTXGP Norton bespoke fully adjustable rear shock |
| Front Brakes: | Single 320mm disc 4 piston caliper | 2 x 320mm full floating Brembo discs, radially mounted twin Brembo M50 monoblock calipers with ABS, Brembo master cylinder |
| Rear Brakes: | Single disc | Single 245mm Brembo disc, Brembo twin piston caliper with ABS, Brembo master cylinder |
| Dry Weight: | 147 kg / 324 lbs | 159 kg / 350.5 lbs |
| Fuel Capacity: | 15 Liters / 3.9 US gal | 18 Litres / 4.7 US gal |