Yamaha XJ 650 Seca (1981) vs Yamaha XS 250 (1977-81) vs Yamaha XZ 550R Vision (1983) vs Yamaha TT-R 250 (1997-98) vs Yamaha TX 650-II (1977-79) vs Yamaha RD / RZ 125LC (1981-82) vs Yamaha XV 125S Virago (1997-02) vs Yamaha YZF 600 R6 Fiat Moto GP Replica (2007) vs Yamaha XJ 750R (1981-82) vs Yamaha SR 250 Classic (1997-) vs Yamaha XJ 400Z (1983)

Comparison technical specifications

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Make:	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha
Model:	XJ 650 Seca	XS 250	XZ 550R Vision	TT-R 250	TX 650-II	RD / RZ 125LC	XV 125S Virago	YZF 600 R6 Fiat Moto GP Replica	XJ 750R	SR 250 Classic	XJ 400Z
Years:	1981	1977-81	1983	1997-98	1977-79	1981-82	1997-02	2007	1981-82	1997-	1983
Engine:	Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder,	Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder	Four stroke, 70°V-twin cylinder. DOHC, 4 valve per cylinder	Four stroke, single cylinder, DOHC, 4-valve per cylinder.	Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder.	Two stroke, single cylinder	Four stroke, V-twin cylinder, 2 valves per cylinder.	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.	Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder.	Four stroke, single cylinder, SOHC, 2 valve	Four stroke, transverse four cylinder, DOHC, four valve per cylinder
Capacity:	653 cc / 39.8 cu-in	248 cc / 15.2 cu-in	552 cc / 33.7 lb-ft	249 cc / 15.1 cu-in	653 cc / 39.8 cu in	123 cc / 7.5 cu-in	124 cc / 7.6 cu-in	599 cc / 36.5 cu-in	749 cc / 45.6 cu-in	239 cc / 15.2 cu-in	399 cc
Bore x Stroke:	63 х 52.4 mm	55 х 52.4 mm	80 х 55 mm	73 x 59.6 mm	75 x 74 mm	56 х 50 mm	41 x 47 mm	67 x 42.5 mm	65 х 56.5 mm	73.5 x 56.5 mm	54 х 53.6 mm
Cooling System:	Air-cooled	Air cooled	Liquid cooled	Air-cooled	Air cooled	Liquid cooled	Air cooled	Liquid cooled	Air cooled	Air cooled	Liquid cooled
Compression Ratio:	9.2:1	9.6:1	10.4:1	10.3:1	8.4:1	6.4:1	NA	12.4;1	9.5:1	8.9:1	10.5:1
Induction:	4x 32mm Hitachi carburetors	2x 32mm Mikuni carburators	2x 36mm Mikuni carburetors	TEIKEI Y30P carb	2 x Mikuni carburetors	24mm Mikuni carburetors	Carburetor	Fuel Injection 38mm throttle bodies	4X 32mm Hitachi CV	34mm Mikuni carburettor	Carburator
Ignition:	Transistorized	Coil and cb	Battery powered inductive	Digital CDI	Battery, induction coil	Hitachi CDI	CDI	TCI	Transistorized	Electronically	Transistorized CDI
Starting:	Electric	Kick	Electric	Electric	Electric and kick	Kick	Electric	Electric	Electric	Electric	Electric
Max Power:	71 hp / 51.8 kW @ 9400 rpm	27 hp / 20.1 kW @ 9500 rpm	64 hp / 46.7 kW @ 9500 rpm	28 hp / 20.6 kW @ 8500 rpm	39.5 kW / 53 hp @ 7200 rpm	20 hp / 15.5 kW @ 9500 rpm	11 hp / 8 kW @ 10000 rpm	124.6 hp / 91.7 kW @14500 rpm	81 hp / 59.6 kW @ 9000 rpm	14.7 kW / 19.72 hp @ 7700 rpm	55 hp / 41kW @ 11500 rpm
Max Torque:	57 Nm / 42 lb-ft @ 7500 rpm	2.2 kgf-m / 15.9 lb-ft @ 8500 rpm	4.8 kgf-m / 34.7 lb-ft @ 8500 rpm	2.8 kgf-m / 27.1 Nm / 20.0 lb-ft @ 7000 rpm	54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm	1.6 kgf-m / 16 Nm @ 9250 rpm	9.4 Nm / 6.9 lb-ft @ 7500 rpm	69.1 Nm / 7.05 kg-m @ 11000 rp @ 1100 rpm	48.5 Nm / 35.7 lb-ft @ 7000 rpm	18.7 ft-lb / 25.5 Nm @ 7000 rpm	3.5 kgf-m / 25.3 lb-ft @ 10000 rpm
Transmission:	5 Speed	6 Speed	5 Speed	6 Speed	5 Speed	6 Speed	5 Speed	6 Speed	5 Speed	5 Speed	6 speed
Final Drive:	Shaft	Chain	Shaft	Chain	Chain	Chain	Chain	O-ring Chain	Chain	Chain	Chain
Front Suspension:	36mm Kayaba forks	Telescopic forks	Telescopic oil damped forks	Telescopic forks, Coil air spring oil damper	Telescopic forks	32mm Telescopic forks	Telescopic forks	41mm upside down forks with 2-way compression damping adjustable	Telescopic fork, 150mm wheel travel.	32mm Telescopic forks	Telescopic forks
Rear Suspension:	Duel Kayaba shocks	Dual shocks, swing arm, 5-position preload adjustable	Gas filled monoshock, 2-way adjustable.	Monocross, Single shock, link-type, w/adjustable preload	Dual shock absorbers	Monocross linkage 6-way preload adjustment	Dual shocks	Fully adjustable rear shock absorber with 2-way compression damping	Swing arm, twin shocks 96mm wheel travel.	Dual shock 5-way preload adjustment.	Monocross, link type
Front Brakes:	2x 268mm disc 1 piston calipers	Single 267mm disc	2x 266mm discs	Single 245mm disc	Twin hydraulic discs, 267 mm	Single 245mm disc	Single 282mm disc	2x 320mm discs	2x 294mm disc 2 piston calipers	Single 200mm disc	2x discs
Rear Brakes:	Drum	178mm Drum	Single 177mm drum	Single 220mm disc	Drum	130mm Drum	130mm drum	Single 220mm disc	Drum	150mm drum	Single disc
Front Tyre:	3.25-19	3.00-18	100/90-18	3.00-21	3.50H-19 4PR	2.75-18-4PR	80/100-18	120/70 ZR17	100/90-18	90/90 R19	90/90-18
Rear Tyre:	120/90-18	3.50-18	110/90-18	4.60-18	4.00H-18 4PR	3.00-18-6PR	130/90-15	180/55 ZR17	120/90-18	120/80 R18	110/90-18
Fuel Capacity:	19.5 Litres / 5.1 US gal	14 Litres / 3.7 US gal	17 Litres / 4.4 US gal	10.2 Litres / 2.7 US gal	15 Litres / 4.0 US gal	13 Litres / 3.4 US gal	9.5 Litres / 2.5 US gal	17.5 Litres / 3.7 gal	19 Litres / 5.0 US gal	10.8 Litres / 2.7 US gal	19 Litres / 5.0 US gal