Yamaha XT 500 (1979) vs Yamaha SR 400 (1993-97) vs Yamaha YS 125 (2017) vs Yamaha XS 650F (1979) vs Yamaha YZF-R 125 (2008) vs Yamaha YZF 600 R6 (2007)

Comparison technical specifications

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Make:	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha
Model:	XT 500	SR 400	YS 125	XS 650F	YZF-R 125	YZF 600 R6
Years:	1979	1993-97	2017	1979	2008	2007
Engine:	Four stroke, single cylinder, SOHC, 2 valve	Four stroke, single cylinder, SOHC, 2 valves per cylinder.	Four stroke, single cylinder, SOHC, 2 valves	Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder.	Four stroke, single cylinder, SOHC, 4 valve	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.
Capacity:	499 cc / 30.5 cuin	399 cc / 24.3 cu-in	124 cc / 7.6 cu-in	653 cc / 39.8 cu in	124 cc / 7.6 cu-in	599 cc / 36.5 cu-in
Bore x Stroke:	87 х 84 mm	87 х 67.2 mm	52.4 x 57.9 mm	75 x 74 mm	52 × 58.6 mm	67 x 42.5 mm
Cooling System:	Air cooled	Air cooled	Air cooled	Air cooled	Liquid cooled	Liquid cooled
Compression Ratio:	9.0 :1	8.5:1	10.0:1	8.4:1	10.4:1	12.4;1
Induction:	32mm Mikuni VM32SS carburetor	BSR33 carburetor	Fuel infection	2 x Mikuni BS38 carburetors	Fuel Injection	Fuel Injection 38mm throttle bodies
Ignition:	Magneto, CB/coil	CDI	TCI	Battery, induction coil	TCI	TCI
Starting:	Kick	Kick	Electric & kick	Electric and kick	Electric	Electric
Max Power:	32 hp / 23.5 kW @ 6500 rpm	27 hp / 17.1 KW @ 7000 rpm	7.8 kW / 10.4 hp @ 7500 rpm	39.5 kW / 53 hp @ 7200 rpm	12.6 kW / 17 hp @ 8500 rpm	124.6 hp / 91.7 kW @14500 rpm
Max Torque:	4.0 kgf-m / 39.2 Nm @ 5500 rpm	27.4 Nm / 6.3 kgf-m @ 6500 rpm	10.8 Nm / 1.1 kg-m @ 6000 rpm	54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm	15 Nm / 1.25 kg-m @ 7500 rpm	69.1 Nm / 7.05 kg-m @ 11000 rp @ 1100 rpm
Transmission:	5 Speed	5 Speed	5 Speed Constant Mesh	5 Speed	6 Speed	6 Speed
Final Drive:	Chain	Chain	Chain	Chain	Chain	O-ring Chain
Front Suspension:	Leading axle coil spring fork	Telescopic fork	Telescopic forks	Telescopic forks	Telescopic forks	41mm upside down forks with 2-way compression damping adjustable
Rear Suspension:	Swing arm adjustable preload	Dual shocks	Bottom link swingarm	Dual shock absorbers	Swinging arm	Fully adjustable rear shock absorber with 2-way compression damping
Front Brakes:	Single 160mm drum	Single disc	Single 245mm disc	Twin hydraulic discs, 267 mm	Single 292mm disc	2x 320mm discs
Rear Brakes:	Single 150mm drum	Drum	120mm Drum	Drum	Single 230mm disc	Single 220mm disc
Front Tyre:	3.00-21	3.50-19	2.75-18-42P	3.50H-19 4PR	90/80 -17	120/70 ZR17
Rear Tyre:	4.00-18	4.00-16	100/80-18-59P	4.00H-18 4PR	130/70 -17	180/55 ZR17
Wheelbase:	1475 mm / 58.0 in	1410 mm / 55.5 IN	1320 mm / 51.9 in	1435 mm / 56.5"	1355 mm / 53.3 inc	1380 mm / 53.4 in
Seat Height:	840 mm / 33.0 in	790 mm / 30.9 in	795 mm / 31.2 in	810 mm / 31.9"	810 mm / 31.8 in	850 mm / 33.5 in
Fuel Capacity:	8.8 Litres / 2.3 US gal	12 Litres / 3.2 gal	14 Litres / 3.6 US gal	15 Litres / 4.0 US gal	13.8 Litres / 3.6 gal	17.5 Litres / 4.6 gal