Suzuki GR650 Tempter

Suzuki GR650 Tempter
Manufacturer	Suzuki
Also called	GR 650 Tempter
Engine	Four stroke, parallel twin cylinders
Compression ratio	8.7:1
Top Speed	177 km/h / 110 mph
Ignition	Battery powered inductive
Transmission	5 Speed
Suspension	Front: 35mm Air assisted forks Rear: Single shock adjustable spring preload
Brakes	Front: Single 260mm disc, 1 piston caliper Rear: Drum
Front Tire	100/90-19
Rear Tire	130/90-16
Wheelbase	1430 mm / 56.3 in
Seat Height	775 mm / 30.5 in
Weight	181 kg / 399 lbs (dry),
Recommended Oil	Suzuki ECSTAR 10w40
Fuel Capacity	12 Liters / 3.2 US gal / 2.6 Imp gal
Manuals	Service Manual

It could reach a top speed of 177 km/h / 110 mph.

Engine

The engine was a Air cooled cooled Four stroke, parallel twin cylinders. The engine featured a 8.7:1 compression ratio.

Chassis

It came with a 100/90-19 front tire and a 130/90-16 rear tire. Stopping was achieved via Single 260mm disc, 1 piston caliper in the front and a Drum in the rear. The front suspension was a 35mm Air assisted forks while the rear was equipped with a Single shock adjustable spring preload. The GR650 Tempter was fitted with a 12 Liters / 3.2 US gal / 2.6 Imp gal fuel tank. The bike weighed just 181 kg / 399 lbs. The wheelbase was 1430 mm / 56.3 in long.

Photos

Overview

Suzuki GR 650 Tempter

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The Suzuki Tempter GR650-X was produced in two models, the budget “X” model has traditional spoked wheels, a single color paint scheme and non-adjustable front forks, all out the door for $2,149. The upgraded “D” version got a two tone color paint scheme, magi style wheels and upgraded adjustable front air forks for $2,399. Cycle World’s test boasted, “For a little over 2 grand you can own a real, honest-to-gosh, full-size, brand-new undented motorcycle.” Today a low mileage model will run about $1,500 – and most well under that reasonable sum – if you can find them.

But besides the clean retro “roadster” styling, the GR sported some interesting innovations under the hood. 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, and added an air swirl feature to the fuel mixture. Suzuki also made a bold engineering design with a trick two-stage flywheel, that when under 3,000 RPM creates added torque – allowing the rider to lug forward in almost any gear without stalling the motor.

Power is delivered to the rear tire by a traditional chain. No kickstart option was offered – but the electric start and handlebar choke adjustment work well. The twin megaphone style exhaust has a sweet subdued sound, and pleasing swept-back lines.

The bike dry weighs in just shy of 400 pounds, making it very agile for a cycle with the power of a 650cc engine. Its 3.4 gallon tank provides a decent distance between fill ups, as the mileage leans toward the mid 50mpg mark when not driven hard. The seat is pretty comfortable and relatively low at just under 30 inches, with plenty of space for a single rider, and decent for two. Under the one-piece seat is a small tool tray and access to the battery, as well as a helmet lock on each side of the frame.

The “full floater” swing arm suspension includes the ability to adjust the preload from 1 (low) to 5 (high) with the round knob located under carbs – useful when riding two-up. The single front disc and rear drum brake provide adequate braking since the bike is so light for its class. The entire package makes for a nice ride on a twisty road, banks and turns with ease, and has plenty of power. The low-end torque makes the bike forgiving in any gear.

Some performance comments rose about the gearing, which is as a bit low and make the bikes rev high, annoying mostly when cruising at higher speeds. Changing out the rear sprocket from the stock 38 to a 36-tooth model is a popular modification, along with swapping the front 15 to a 16-tooth sprocket. The electrical system is another potential weak spot, with the stock regulator/rectifier unit somewhat underpowered, so another popular modification is to replace the unit with a larger more powerful one. My bike came with the rear sprocket modification already, and in the course of owning it I’ve upgraded the R/R unit, as well as rebuilt the starter motor and added some aftermarket accessories.

When first introduced the bikes were well received by the motorcycle press. Cycle World wrote in their favorable review, “You’ll notice we’ve been carefully referring to this as the GR650, a perfectly good name for this great bike…Tempter is a silly name. This is not a silly motorcycle.”

Make Model	Suzuki GR 650 Tempter
Year.	1983 - 89
Engine Type	Four stroke, parallel twin cylinders
Displacement	651 cc / 39.7 cu in
Bore X Stroke	77 x 70 mm
Compression	8.7:1
Cooling System	Air cooled
Lubrication System	Wet sump
Induction	2 x Mikuni carburetors
Ignition	Battery powered inductive
Starting	Electric
Max Power	36.4 kW / 50 hp @ 7200 rpm
Max Torque	61 Nm / 6.22 lgf-m / 45.0 lb-ft @ 3500 rpm
Transmission	5 Speed
Final Drive	Chain
Front Suspension	35mm Air assisted forks
Front Wheel Travel	132 mm / 5.2 in
Rear Suspension	Single shock adjustable spring preload
Rear Wheel Travel	74 mm / 2.9 in
Front Brakes	Single 260mm disc, 1 piston caliper
Rear Brakes	Drum
Front Tire	100/90-19
Rear Tire	130/90-16
Wheelbase	1430 mm / 56.3 in
Seat Height	775 mm / 30.5 in
Dry Weight	181 kg / 399 lbs
Fuel Capacity	12 Liters / 3.2 US gal / 2.6 Imp gal
Consumption Average	4.9 L/100 km / 20.3 km/l / 47.7 US mpg / 57.2 Imp mpg
Standing ¼ Mile	13.7 sec
Top Speed	177 km/h / 110 mph