Yamaha XJ 650 Maxim (1982) vs Yamaha XS 650 Midnight Special (1981) vs Yamaha YZF 600R Thundercat (1997) vs Yamaha SR 400 (1983-87) vs Yamaha XJ 750 Seca (1981-83) vs Yamaha FZ-6N S2 (2007)

Comparison technical specifications

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Make:	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha	Yamaha
Model:	XJ 650 Maxim	XS 650 Midnight Special	YZF 600R Thundercat	SR 400	XJ 750 Seca	FZ-6N S2
Years:	1982	1981	1997	1983-87	1981-83	2007
Engine:	Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder,	Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder.	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder	Four stroke, single cylinder, SOHC, 2 valves per cylinder.	Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.
Capacity:	653 cc / 39.8 cu-in	653 cc / 39.8 cu in	599 cc / 36.5 cu-in	399 cc / 24.3 cu-in	749 cc / 45.6 cu-in	599 cc / 36.5 cu-in
Bore x Stroke:	63 х 52.4 mm	75 x 74 mm	62 x 49.6 mm	87 х 67.2 mm	65 х 56.4 mm	65.5 x 44.5 mm
Cooling System:	Air-cooled	Air cooled	Liquid cooled	Air cooled	Air cooled	Liquid cooled
Compression Ratio:	9.2:1	8.5:1	12.0:1	8.5:1	9.2:1	12.2:1
Induction:	4x 32mm Hitachi carburetors	2 x Mikuni BS34SU carburetors	4 x 36 mm Keihin CV downdraft carburetors	BSR33 carburetor	4x 34mm Mikuni Carburetors	Group injection type fuel injection, 36mm Funnel diameter
Ignition:	Transistorized	Battery, induction coil	Digital TCI	CDI	Transistorized	TCI Digital CDI
Starting:	Electric	Electric and kick	Electric	Kick	Electric	Electric
Max Power:	71 hp / 51.8 kW @ 9400 rpm	39.5 kW / 53 hp @ 7200 rpm	72.9 kW / 100 hp @ 11500 rpm	27 hp / 17.1 KW @ 7000 rpm	82 hp / 59.9 kW @ 9000 rpm	98 hp / 72 kW @ 12000 rpm
Max Torque:	57 Nm / 42 lb-ft @ 7500 rpm	54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 5500 rpm	65.7 Nm / 6.7 kgf-m / 48.7 lb-ft @ 9500 rpm	27.4 Nm / 6.3 kgf-m @ 6500 rpm	67 Nm / 6.9 kgf-m @ 7500 rpm	63.1 Nm / 6.4 kgf-m @ 10000 rpm
Transmission:	5 Speed	5 Speed	6 Speed	5 Speed	5 Speed	6 Speed
Final Drive:	Shaft	Chain	530 O-ring chain OEM sprocket sizes per tooth Front= 15 Back= 47	Chain	Shaft	Chain
Front Suspension:	26mm Air assisted telescopic forks	Telescopic forks	41 mm telescopic fork adjustable preload, compression and rebound damping	Telescopic fork	Telescopic forks	43mm Telescopic fork,
Rear Suspension:	Duel Kayaba shocks, 5-way adjustable spring preload	Dual shock absorbers	Monoshock adjustable preload, bump and rebound	Dual shocks	Swing arm	Swingarm Link less type Monocross
Front Brakes:	Single 300mm disc	Twin hydraulic discs, 267 mm	2x 300 mm Discs, 4 piston calipers	Single disc	Single 269mm disc	2x 298 mm discs
Rear Brakes:	Drum	Single hydraulic disc, 267 mm	Single 245mm disc, 2 piston caliper	Drum	Drum	Single 245 mm disc
Front Tyre:	3.25 H19	3.50S-19	120/60-17	3.50-19	3.25-19	120/70 ZR17
Rear Tyre:	130/90 H16	130/90S-16	160/60-17	4.00-16	120/90-18	180/55 ZR17
Fuel Capacity:	13 Litres / 3.4 US gal	11.5 Litres / 3.0 US gal	19 Litres / 5.0 US gal / 4.2 Imp gal	12 Litres / 3.2 gal	19 Litres / 4.7 US gal	19 Litres / 5.0 US gal