Yamaha XJ 750 Seca (1981-83) vs BMW R 1250GS 40 Years Edition (2021) vs Yamaha RD 350N (1983)
Comparison technical specifications
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| Make: | Yamaha | BMW | Yamaha |
| Model: | XJ 750 Seca | R 1250GS 40 Years Edition | RD 350N |
| Years: | 1981-83 | 2021 | 1983 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, with two overhead spur gear driven camshafts, a counterbalance shaft and variable intake camshaft control system BMW ShiftCam, 4 valves per cylinder, intake 40mm, outlet 34 mm | Two stroke, parallel twin cylinder |
| Capacity: | 749 cc / 45.6 cu-in | 1254 cc / 76.5 cu-in | 347 cc / 21.1 cu-in |
| Bore x Stroke: | 65 х 56.4 mm | 102.5 x 76 mm | 64 х 54 mm |
| Cooling System: | Air cooled | Liquid / Air cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 12.5:1 | 6.2 :1 |
| Induction: | 4x 34mm Mikuni Carburetors | Electronic intake pipe injection, 52mm Ø throttle valve | 2x 26mm Mikuni slide-needle carburetor |
| Starting: | Electric | Electric | Kick |
| Max Power: | 82 hp / 59.9 kW @ 9000 rpm | 136 hp / 100 kW @ 7750 rpm | 59 hp / 43.9 kW @ 9000 rpm |
| Max Torque: | 67 Nm / 6.9 kgf-m @ 7500 rpm | 143 Nm / 105.4 lb-ft @ 6250 rpm | 40.2 Nm / 4.1 kgf-m / @ 8000 rpm |
| Transmission: | 5 Speed | Constant mesh 6-speed gearbox with helical gearing system | 6 Speed |
| Final Drive: | Shaft | Shaft | Chain |
| Frame: | Steel, double cradle frame | Two-section frame concept consisting of main frame with bolt-on rear frame, load-bearing engine | Tubular mild steel, double front downtubes |
| Front Suspension: | Telescopic forks | BMW Motorrad 37mm Telelever, central spring strut | 32mm stanchion tube forks |
| Rear Suspension: | Swing arm | Cast aluminium single-sided swing arm with BMW Motorrad Paralever; WAD strut (travel-related damping), spring pre-load hydraulically adjustable (continuously variable) at handwheel, rebound damping adjustable at handwheel | Single shock cantilever 5-way adjustable spring preload |
| Front Brakes: | Single 269mm disc | 2x 305mm floating discs, 4-piston radial brake calipers | 2x 267mm disc 1 piston caliper |
| Rear Brakes: | Drum | Single 276mm disc, 2-piston floating caliper | Drum |
| Front Tyre: | 3.25-19 | 120/70 R19 | 3.00-18 |
| Rear Tyre: | 120/90-18 | 170/60 R17 | 3.50-18 |
| Dimensions: | Length 2195 mm | Length 2207.0 mm / 86.9 in Width 952.5 mm / 37.5 in Height 1430 mm / 56.3 in | Length 2080 mm / 81.8 in Width 750 mm / 29.5 in Height 1090 mm / 42.9 in |
| Wheelbase: | 1445 mm / 56.8 in | 1514 mm / 60 in | 1365 mm / 53.7 in |
| Fuel Capacity: | 19 Litres / 4.7 US gal | 20 Litres / 5.3 US gal | 16.5 Liters / 4.3 US gal |