1991 BMW R 65 Specifications

Name: 1991 BMW R 65
Brand: BMW

Enduro / Off-Road • Specs last verified 13 July 2026

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1991 BMW R 65 Overview

BMW R 65 is an enduro / off-road motorcycle, displacing 649 cc. Power comes from a Two cylinder boxer engine running OHV valve actuation, a compression ratio of 8.4:1. Bore and stroke come in at 82 x 61.5 mm. On the performance side, it delivers. Top speed is factory-quoted at 147 km/h. On the road, the 1991 R 65 tips the scales at 205 kg and carries a 22-litre fuel tank. That's roughly 35.8 kg heavier than the average enduro / off-road motorcycle in our database. The full 1991 BMW R 65 spec sheet below covers every technical detail, from suspension travel to tyre sizes.

1991 BMW R 65 compared with other bikes in the Enduro / Off-Road category

We checked the recorded figures for the 1991 BMW R 65 against up to 1434 bikes in the Enduro / Off-Road category in our database, counting each model once at the model year nearest to this one.

Only 384 of the other 1433 bikes in the Enduro / Off-Road category have a larger engine displacement than the 649 cc of the R 65.
With 205 kg, the R 65 has the joint 252nd heaviest wet weight of 774 bikes in the Enduro / Off-Road category, 21% above the category average of 169.2 kg.
Narrowing the field to the 267 models within five model years of it, the engine displacement of 649 cc is larger than that of 232 of the other 266.

Versus the 1990 model

The figures we track are unchanged from the 1990 model: wet weight, displacement and top speed all match.

1991 R 65 - Pros & Cons

Strengths

Strong front braking: Stopping power up front is strong thanks to the single disc setup, with plenty of room to upgrade further with braided lines.
Large fuel range: A 22-litre tank means fewer stops on longer rides - a genuine plus for touring or a lengthy daily commute.
Low-maintenance final drive: Running a shaft final drive cuts out the regular chain cleaning and tensioning that most bikes need.

Considerations

Age-related wear: Nothing specific stands out as a weak point on the R 65 - the usual used-bike checks (service history, consumables, tyres) apply.

Wear Points & Servicing Notes

Brake disc and pad wear

Braking up front comes from single disc - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Final drive maintenance

The R 65 uses shaft final drive: essentially maintenance-free day to day, with periodic gear-oil changes the only real service item.

R 65 - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 1991 BMW R 65 with its 649 cc enduro / off-road, cover the fundamentals: service book and oil change history, drivetrain wear, and any sign of oil weeping around the casings. This model runs shaft final drive, so ask for proof the shaft-drive gear oil has been changed on schedule - it's easy to overlook since there's no chain to draw attention to it. Now 35 years old, this enduro / off-road is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Cold-starting it yourself tells you a lot - a healthy R 65 should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects the R 65's 649 cc two cylinder boxer like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). With an 8.4:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

1991 BMW R 65 - Frequently Asked Questions

What engine does the 1991 BMW R 65 have?

The 1991 BMW R 65 uses a Two cylinder boxer engine with 649 cc of displacement.

What is the top speed of the 1991 BMW R 65?

The 1991 BMW R 65 has a factory-quoted top speed of 147 km/h. Real-world speeds vary depending on rider weight, conditions and state of tune.

How much does the 1991 BMW R 65 weigh?

The 1991 BMW R 65 weighs 205 kg. This is the manufacturer's wet figure.

What is the fuel tank capacity of the 1991 BMW R 65?

The 1991 BMW R 65 has a 22-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 366-440 km between stops.

What brakes does the 1991 BMW R 65 have?

The 1991 BMW R 65 uses single disc at the front and Expanding brake at the rear.

What tyre sizes does the 1991 BMW R 65 use?

The 1991 BMW R 65 runs 90/90-18 front and 120/90-18 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What is the compression ratio of the 1991 BMW R 65?

The 1991 BMW R 65 runs a compression ratio of 8.4:1. Always use the minimum octane rating specified in the owner's manual.

BMW R 65 Spec Evolution

The BMW R 65 was produced across 14 model years (1979-1992). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification	1979	1980	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990	1991	1992
Wet Weight	210 kg / 463 lbs	210 kg / 463 lbs	204.0 kg / 449.7 lbs	204.0 kg / 449.7 lbs	204.0 kg / 449.7 lbs	204.0 kg / 449.7 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs	205.0 kg / 451.9 lbs
Engine Type	-	Two cylinder boxer	Two cylinder boxer	Two cylinder boxer, four-stroke	Two cylinder boxer, four-stroke	Two cylinder boxer, four-stroke	Two cylinder boxer	Two cylinder boxer, four-stroke	Two cylinder boxer	Two cylinder boxer	Two cylinder boxer	Two cylinder boxer	Two cylinder boxer	Two cylinder boxer
Top Speed	-	175.0 km/h / 108.7 mph	175.0 km/h / 108.7 mph	175.0 km/h / 108.7 mph	175.0 km/h / 108.7 mph	175.0 km/h / 108.7 mph	178.0 km/h / 110.6 mph	178.0 km/h / 110.6 mph	178.0 km/h / 110.6 mph	178.0 km/h / 110.6 mph	147.0 km/h / 91.3 mph	147.0 km/h / 91.3 mph	147.0 km/h / 91.3 mph	147.0 km/h / 91.3 mph
Fuel Capacity	22 Litres / 5.8 US gal	22 Litres / 5.8 US gal	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons	22.00 litres / 5.81 gallons
Brakes - Rear	Drum	Drum	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake	Expanding brake
Final Drive	Shaft	Shaft	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)	Shaft drive (cardan)
Compression Ratio	9.2:1	9.2:1	9.2:1	9.2:1	9.2:1	9.2:1	8.7:1	8.7:1	8.7:1	8.7:1	8.4:1	8.4:1	8.4:1	8.4:1
Tyres - Front	3.25 -18	3.25 -18	3.25-18	3.25-18	3.25-18	3.25-18	90/90-18	90/90-18	90/90-18	90/90-18	90/90-18	90/90-18	90/90-18	90/90-18

Key Specifications

Engine

Two cylinder boxer

Power

Not recorded

Torque

Not recorded

Top Speed

147.0 km/h / 91.3 mph

Weight

205.0 kg / 451.9 lbs

Fuel Capacity

22.00 litres / 5.81 gallons

Full 1991 BMW R 65 Specifications

Fuel Capacity 22.00 litres / 5.81 gallons

Wet Weight 205.0 kg / 451.9 lbs

Top Speed 147.0 km/h / 91.3 mph

Bore x Stroke (in,) 3.2 x 2.4 inches

Bore x Stroke (mm) 82.0 x 61.5 mm

Displacement (cc) 649.00 cc

Displacement (ci) 39.60 cubic inches

Engine Type Two cylinder boxer

Fuel Control OHV

Stroke 4

Compression Ratio 8.4:1

Valve System 2

Final Drive Shaft drive (cardan)

Gearbox 5-speed

Brakes - Front Single disc

Brakes - Rear Expanding brake

Tyres - Front 90/90-18

Tyres - Rear 120/90-18

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.

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1991 BMW R 65

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