Suzuki GSX 1400Z (2004-05) vs Aprilia RS4 125 (2011) vs Yamaha YZF-R 125 (2022) vs Aprilia Atlantic 200 (2008-10) vs BMW R 1200RT (2005) vs Norton Commando 850 Roadster MKII (1975)

Comparison technical specifications

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Make:	Suzuki	Aprilia	Yamaha	Aprilia	BMW	Norton
Model:	GSX 1400Z	RS4 125	YZF-R 125	Atlantic 200	R 1200RT	Commando 850 Roadster MKII
Years:	2004-05	2011	2022	2008-10	2005	1975
Engine:	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.	Four stroke, single cylinder, DOHC, 4 valves	Four stroke, single cylinder, SOHC, 4 valve	Four stroke, single cylinder, SOHC, 4 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, 4 valves per cylinder	Four stroke, parallel twin cylinder, push rod 2 valves per cylinder.
Capacity:	1402 cc / 85.6 cu in	124.8 cc / 7.6 cu in	124.7 cc / 7.6 cu-in	199 cc / 12.1 cu in	1170 cc / 71.4 cu in	829 cc / 50.6 cu in
Bore x Stroke:	81 x 68 mm	58 X 47 mm	52 x 58.6 mm	72 x 48.6 mm	101 x 73 mm	77 x 89 mm
Compression Ratio:	9.5:1	12.5 ± 0.5:1	11.2:1	11.5:1	12.0:1	8.5:1
Cooling System:	Air/oil cooled	Liquid cooled	Liquid cooled	Liquid cooled	Air/Oil cooled	Air cooled
Induction:	Fuel injection with 34mm throttle bodies	Electronic injection	Electronic fuel Injection	Keihin CVK 7C Ø 30 mm or Walbro WVF 7D Ø29 mm	BMW engine management, BMS-K	2 x Ø32 mm Amal concentric carburetors
Ignition:	Electronic ignition	Electronic with CDI capacity discharge	TCI	Electronic, Magneti Marelli	Digital engine management	120W Lucas alternator
Starting:	Electric	Electric	Electric	Electric	Electric	Electric and kick
Max Power:	78 kW / 105 hp @ 6800 rpm	11.7 kW / 16 hp @ 10500 rpm	11 kW / 14.7 hp @ 9000 rpm	10 kW / 13.5 hp @ 8000 rpm	81kW / 110 hp @ 7500 rpm	60 hp / 44.7 kW @ 6200 rpm
Transmission:	6 Speed	6 Speed	6 Speed, Constant mesh	Automatic	6 Speed	4 Speed
Final Drive:	Chain	Chain	Chain	Belt	System Enclosed driveshaft with two universal joints	Chain
Front Suspension:	46 mm Telescopic forks, preload, compression and rebound damping adjustable	Ø41 mm Upside down fork	41mm Upside-down telescopic fork,	Hydraulic forks, Ø 35 mm	BMW Motorrad Telelever, stanchion diameter 35mm, central spring strut, rebound damping electronically adjustable with standard ESA	Telescopic forks
Rear Suspension:	Dual piggyback reservoir shocks fully adjustable for preload, compression and rebound damping	Asymmetric swingarm with monoshock	Swingarm, link type suspension	Single hydraulic shock, adjustable preload	Die-cast aluminium single-sided swinging arm with BMW Motorrad EVO-Paralever, spring preload hydraulically adjustable to continuously variable levels by means of electronically adjustable ESA, rebound damping with standard ESA	Swing arm with Girling coil springs
Front Brakes:	2 x 320 mm Discs, 6 piston calipers	Single Ø300 mm disc, 4 piston caliper	Single 292mm disc	Single Ø 240 mm disc, with hydraulic transmission	2 x 320mm Discs, 4 piston callipers	Single disc
Rear Brakes:	Single 260 mm disc, 2 piston caliper	Single Ø218 mm disc, 1 piston caliper	Single 230mm disc	Single Ø 190mm disc, with hydraulic transmission, combined with front	Single 265mm disc, 2 piston caliper	Single disc
Front Tyre:	120/70 ZR17	110/80 17	100/80 -17 M/C	110/90 -13	120/70 ZR17	4.10-19
Rear Tyre:	190/50 ZR17	130/70 17	130/70 -17 M/C	130/70 -13	180/60 ZR17	4.10-19
Fuel Capacity:	22 Litres / 5.8 US gal / 4.8 Imp gal	14.5 Liters / 3.8 gal	11.5 Litres / 3.0 US gal	10.5 Litres / 2.8 US gal	27 Liters / 7.1 US gal	19 Litres / 5.0 US gal