BMW R 65 Monolever (1984) vs Aprilia SX 50 (2013) vs KTM 890 SMT (2023) vs Yamaha SRV 250S (1995-96)
Comparison technical specifications
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| Make: | BMW | Aprilia | KTM | Yamaha |
| Model: | R 65 Monolever | SX 50 | 890 SMT | SRV 250S |
| Years: | 1984 | 2013 | 2023 | 1995-96 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Single cylinder, two stroke | Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder | Four stroke, V twin, SOHC |
| Capacity: | 649.6 cc / 39.6 cu in. | 49.9 cc / 3.04 cu in | 889 cc / 54.2 cu-in | 248 cc / 15.0 cu-in |
| Bore x Stroke: | 82 x 61.5 mm | 39.9 x 40 mm | 90.7 x 68.8 mm | 49 x 66 mm |
| Compression Ratio: | 8.4:1 | 11.5:1 | 13.5:1 | 9.8 : 1 |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled with water/oil heat exchanger | Air cooled |
| Induction: | 2 x Bing constant depression carburetors | Dell'Orto PVHA 17.5 carburetor | DKK DellOrto fuel-Injection throttle body 46mm | 2x Mikuni BDS26 carburetors |
| Starting: | Electric | Kick | Electric | |
| Transmission: | 5 Speed | 6 speed | 6 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | Chain 520 X-Ring | Chain |
| Front Suspension: | Telescopic hydraulic forks | Hydraulic fork, Ø 40 mm | 43mm WP APEX upside-down forks | Telescopic forks |
| Rear Suspension: | Monolever swinging arm | High strength steel swingarm, hydraulic monoshock | WP APEX Monoshock | Dual shocks |
| Front Brakes: | 2x ∅260mm discs, 2 piston calipers | Single stainless steel disc, Ø 260 mm, floating caliper | 2 x 260mm discs, 4 piston, radially mounted caliper | Single disc |
| Rear Brakes: | Single ∅200mm drum | Single disc, Ø 180 mm, floating caliper | Single 260mm disc, 1 piston floating caliper | Drum |
| Front Tyre: | 90/90 - 18 | 100/80 ZR17 | 120/70 ZR 17 | 90/90-18 |
| Rear Tyre: | 120/90 - 18 | 130/70 ZR17 | 180/55 ZR 17 | 110/90-18 |
| Fuel Capacity: | 22 liters / 5.8 US gal | 7 L / 1.85 US gal | 15.8 Litres / 4.2 US gal | NA |