Yamaha RD / RZ 125LC (1981-82) vs BMW G 650 X Challenge (2008) vs BMW HP 4 Racer (2018)
Comparison technical specifications
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| Make: | Yamaha | BMW | BMW |
| Model: | RD / RZ 125LC | G 650 X Challenge | HP 4 Racer |
| Years: | 1981-82 | 2008 | 2018 |
| Engine: | Two stroke, single cylinder | Four stroke, single cylinder, DOHC, 4 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 123 cc / 7.5 cu-in | 652 cc / 39.8 cub in. | 999 cc / 61 cu in. |
| Bore x Stroke: | 56 х 50 mm | 100 x 83 mm | 80 x 49,7 mm |
| Compression Ratio: | 6.4:1 | 11.5:1 | 13.7-13.9 : 1 |
| Induction: | 24mm Mikuni carburetors | Fuel induction | Mixture control engine management Electronic racing injection, variable intake pipe length, four selectable modes |
| Starting: | Kick | Electric | Electric |
| Max Power: | 20 hp / 15.5 kW @ 9500 rpm | 39 kW / 53 hp @ 7000 rpm | 158 kW / 215 hp @ 13900 rpm (maximum speed 14,500 rpm) |
| Max Torque: | 1.6 kgf-m / 16 Nm @ 9250 rpm | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5250 rpm | 120 Nm / 88.5 lb-ft @ 10000 rpm |
| Transmission: | 6 Speed | 5 Speed | Constant-mesh 6 speed racing transmission (EVO) with straight-cut gears |
| Final Drive: | Chain | Chain | Chain, Drive 16/43 (adjustable as part of equipment pack: sprocket 15, 16, 17, chainwheel 41, 42, 43, 44, 45) |
| Front Suspension: | 32mm Telescopic forks | ∅45mm Upside-down telescopic fork | Öhlins FGR 300 WSBK fork, adjustable rebound and compression-stage damping, adjustable spring preload, Öhlins SD052 adjustable steering damper, front wheel quick-change system thanks to rotatable forklegs with front-wheel cover mounted (brake calipers need not be removed to change a wheel) spring stiffness 10.5 N/mm |
| Rear Suspension: | Monocross linkage 6-way preload adjustment | Aluminum 2-unit cast swing arm, air damping | Aluminium WSBK swinging arm, Öhlins TTX 36 GP central spring strut, adjustable rebound and compression-stage damping, adjustable spring preload, top spring strut pivot point adjustable (0/3 mm), adjustable spring strut deflection (tension strut length), contact surfaces for wheel spacer bush on chain tensioners for simple/hands free wheel fitting, chain tensioner titanium on outside, aluminium on inside, CFRP auxiliary stand mountings on swinging arm, spring stiffness 95N/mm |
| Front Brakes: | Single 245mm disc | Single ∅300mm disc, 2 piston calipers | 2 x Brembo Racing disc brake, T-floating racing brake discs, 320×6.75 mm diameter, 4-piston monobloc WSBK GP4-PR fixed caliper with titanium pistons, Brembo Racing RCS19X18 master cylinder, including adjustable Brembo Racing brake lever, Brembo Racing clutch lever (without clutch switch) |
| Rear Brakes: | 130mm Drum | Single ∅240mm disc, 1 piston calipers | Single Brembo Racing disc brake, 4-piston WSBK fixed caliper with titanium pistons, brake disc diameter 220×4.0 mm Dimensions / weights |
| Front Tyre: | 2.75-18-4PR | 90/90 S 21 | 120/70 ZR 17 Pirelli Diabolo Superbike Slick SC2 |
| Rear Tyre: | 3.00-18-6PR | 120/70 S 18 | 200/60 ZR 17 Pirelli Diabolo Superbike Slick SC2 |
| Dimensions: | Length 1990 mm / 78.3 in Width 735 mm / 28.9 in Height 1190 mm / 46.8 in | Length: 2205 mm / 86.8 in. Width: 907 mm / 35.7 in. (incl. mirrors) Height: 1255 mm / 49.4 in. (excl. mirrors) | Length 2070 mm / 81.6 in Width (incl. mirrors) 777 mm / 30.0 in Height (excl. mirrors) 1193 mm / 47.0 in |
| Wheelbase: | 1295 mm / 50.9 in | 1500 mm / 59.1 in. | 1440 mm |
| Seat Height: | 775 mm / 30.5 in | 930 mm / 36.6 in (low seat: 910 mm / 35.8 in.) | 831 mm / 32.7 in - (rider seat low / high, 816 mm / 32.1 in / 846 mm / 33.3 in) |
| Dry Weight: | 98 kg / 216 lbs | 144 kg / 317 lbs. | 146 kg / 322 lbs |
| Fuel Capacity: | 13 Litres / 3.4 US gal | 9.5 Litres / 2.5 US gal | 17.5 Litres / US 4.6 gal. |