Make Model.



1985 -86


18000+ units


Four-stroke, horizontal three cylinder in-line, DOHC, 2 valves per cylinder


740 cc / 45 cub. in.
Bore x Stroke 67 x 70 mm
Compression Ratio 11.0:1
Cooling Liquid cooled
Lubrication Wet sump


Electronic injection, Bosch LE-Jetronic



Max Power

55 kW / 75 hp @ 8500 rpm

Max Torque

68 Nm / 6.9 kgf-m / 50 ft lb @ 6750 rpm


5 Speed


Single dry plate
Final Drive Shaft
Gear Ratios 1st 4.50 / 2nd 2.96 / 3rd 2.30 / 4th 1.88 / 5th 1.67:1
Frame Double-downtube frame with engine as a stressed member; box-section aluminum monolever swing arm.

Front Suspension

Telescopic fork with hydraulic shock absorber.

Front Wheel Travel

185mm / 7.3 in.

Rear Suspension

Monolever swinging arm.

Rear Wheel Travel

114mm / 4.5 in.

Front Brakes

2 x ∅285mm discs, 2 piston calipers

Rear Brakes

Single ∅285mm disc

Front Tyre


Rear Tyre



Length  2220 mm / 87.4 in.

Width      900 mm / 35.4 in.

Height   1340 mm / 51.2 in.

Wheel Base 1516 mm / 59.7 in.
Seat Height 810 mm /31.9 in. or 760 mm / 29.9 in. for low seat model
Ground Clearance 175 mm / 6.9 in.

Dry Weight

229 kg / 505 lbs

Wet Weight

235 kg / 518 lbs

Fuel Capacity 

21 liters / 5.54 US gal

Fuel consumption

4 l/100 km / 25 km/l / 59 US mpg

Acceleration 0 - 100 km/h / 62 mph

4.7 sec.

Top Speed

210 km/h / 131 mph


The K75S as far as I can tell, was made with almost the same intent as the R65 LS. It's a small bike using the contemporary engine technology, aimed at sportier riders, and not caring much about full-on touring. It has a number of sportier features than other bikes in the line, without giving up the basic refinement and style of those bikes.

Since the K-bike line was intended to replace the Boxers entirely at the time this motorcycle was being designed, this makes sense as an R65 LS replacement.

The engine is a three-cylinder inline engine, much like a shrunk-down car engine. It uses fuel injection instead of carburation. From the clutch to the drive shaft is basically unchanged -- still a single plate clutch and nearly the same clunky gearbox. The brakes in front are remarkably similar to the R65 LS's, but the back is a much better disc brake. The frame is significantly different from the R65, with the engine forming a member of the frame, rather than resting inside it.