Yamaha XJ650 Maxim: review, history, specs

Yamaha XJ650
Manufacturer	Yamaha
Also called	Maxim
Production	1980 - 1986
Class	Standard
Engine	653cc in-line four, four-stroke
Bore / Stroke	63.0mm x 52.4mm
Compression ratio	9.2:1
Top Speed	122 mph (196 km/h)
Horsepower	73 HP (54.4 KW) @ 9000RPM
Torque	42 lb-ft (57 Nm) @ 7500RPM
Ignition	transistorized
Spark Plug	NGK BP7ES '80-83
Battery	YUASA 12N12A-4A-1 '80-83
Transmission	Gear box: 5-speed Final Drive: shaft drive (cardan) Clutch: Wet multi-plate
Final Drive	Shaft
Suspension	Front: 36mm Showa 140mm Wheel Travel, Adjustments For Air Pressure Rear: Dual Showa Dampers
Brakes	Front: single disc Rear: expanding brake
Front Tire	3.25-19
Rear Tire	120/90-18
Wheelbase	56.89 inches (1445 mm)
Seat Height	30.71 inches (780 mm)
Weight	262.0 kg (wet)
Oil Filter	K&N KN-144
Recommended Oil	Yamalube 10w-40
Fuel Capacity	5.02 Gallon (19.00 Liters)
Related	Yamaha XJ650L
Manuals	Service Manual

1980 Yamaha Maxim 650

Introduced in 1980, the XJ650 better known as the Yamaha Maxim 650 was a inline-four, shaft drive that became extremely popular. It was a high performance cruiser that continued the street bike excitement created by the Yamaha Specials. It could reach a top speed of 122 mph (196 km/h). Max torque was 42 lb-ft (57 Nm) @ 7500 RPM. Claimed horsepower was 73 HP (54.4 KW) @ 9000 RPM. It also came in a Turbo variant in the Yamaha XJ650L.

Engine

The engine was a air cooled in-line four, four-stroke. A 63.0mm bore x 52.4mm stroke result in a displacement of just 653.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive

The bike has a 5-speed transmission. Power was moderated via the Wet multi-plate.

Chassis

It came with a 3.25-19 front tire and a 130/90-16 rear tire. Stopping was achieved via single disc in the front and a expanding brake in the rear. The front suspension was a 36mm Showa 140mm Wheel Travel, Adjustments For Air Pressure in the 1982 model while the rear was equipped with a Dual Showa Dampers. The XJ650 Turbo was fitted with a 5.02 Gallon (19.00 Liters) fuel tank. The wheelbase was 56.89 inches (1445 mm) long.

Police

This bike was very commonly kitted out as a police bike.

1980 - 1985 Yamaha XJ650

Announced for 1980, two versions of the 650 were produced: the sporting Seca for the European market and the Maxim for the U.S. The Maxim featured high bars, a stepped seat, a 17 rear wheel and breathing modifications including Yamaha’s swirl-inducing YICS Yamaha Induction Control System intakes designed to pacify the EP.

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