Suzuki GR650 Tempter 1983-1989 Service Manual

Cycle World's own 1983 contemporary road test doesn't dance around the genuine reason to buy this bike: "one feature stands out as an overriding reason to buy the GR650. Price. List on the standard GR650 is $2399. The lower cost GR650X has a list price of $2149. That, friends, is cheap. This is a blue-light-special on two wheels. It's the equivalent of the 19-cent hamburger, the $29.95 paint job and free kittens rolled into one." That same review is genuinely candid about the one thing it would change: "there are only two things we'd want to see changed. First, raise the top gear ratio. Second, change the name... On the sidecovers there's another name. Tempter. Come on, Suzuki. Tempter is a silly name. This is not a silly motorcycle. It's an excellent motorcycle."

Power comes from a 651cc air-cooled parallel-twin, DOHC with 4 valves total (2 per cylinder), a 77mm x 70mm bore and stroke, and an 8.7:1 compression ratio, fed by 2 Mikuni CV BS36SS carburetors, delivering a claimed 48.8-50 hp at 7,200 rpm and roughly 45 lb-ft (61 Nm) of torque, run through a 5-speed sequential manual transmission with chain final drive. Motorcyclespecs.co.za's own period coverage confirms the genuine engineering pedigree behind this powerplant: "the engine is a four-stroke twin, with dual overhead cams on each cylinder, and utilizes a twin dome combustion chamber first introduced in the 1981 Suzuki GS650 models, which improves" combustion efficiency — real proven architecture borrowed directly from Suzuki's contemporary sportbike engine.

Cycle World's own detailed technical account confirms the genuinely thoughtful engineering behind the fuel-delivery system: "Suzuki claims this air induction enables the GR650 to operate with much leaner air-fuel mixtures, improving economy. This improvement is most effective at low engine speeds, but the 650 is tuned to run at lower than normal speeds, and run well." That same review confirms simple, well-executed hardware throughout the driveline: "the multiplate wet clutch is disengaged by a screw-type collar rotating on ball bearings. The shift drum runs on needle bearings and has a low-friction coating for easy shifting. Final drive is by 530 O-ring chain." Cycle World's own review confirms the chassis followed a deliberately conventional approach: "around this engine is wrapped a frame that's neither radically new or old fashioned. Its general configuration is entirely conventional, with a pair of long downtubes running from the steering head, under the engine and wrapping back up to the large backbone."

Wikipedia's own production history confirms a genuine market-specific limitation worth knowing before assuming universal availability across this range: "in the United States it was called the GR650 Tempter, and was only sold there for the 1983 and 1984 model years" — American buyers had a genuinely narrow two-year window to purchase this exact bike, while Suzuki continued building and selling the GR650 in other international markets through 1989. Wikipedia's own confirmed specification sheet lists a 35mm air-assisted front fork with 132mm of travel, a single rear shock with adjustable spring preload offering 74mm of travel, a single 260mm front disc with a 1-piston caliper, and a rear drum brake. Suzukicycles.org's own archived brochure for the related, higher-performance GR650X variant confirms a genuinely sportier state of tune within the same family: "62 hp @ 9,500 rpm, 4.8 kg-m @ 8,000 rpm" from a "two-stage flywheel" configuration, alongside a claimed 405 lb dry weight — a real performance step above the standard GR650's more relaxed, economy-focused tune. Dry weight on the standard model came in at 399-405 lbs, with a 12-litre (3.2 US gallon) fuel tank delivering genuinely strong real-world economy around 48-58 mpg.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 1983-1989 GR650/Tempter running the way it was built to.