CycleChaos

BMW R75/5



The BMW R 75/5 was a air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder Classic motorcycle produced by BMW in 1969. Max torque was 44.26 ft/lbs (60.0 Nm) @ 5000 RPM. Claimed horsepower was 50.02 HP (37.3 KW) @ 6200 RPM.

Bmw-r-755-1969-1973-2.jpg
BMW R 75/5
Manufacturer
BMW
Production 1969 - 1976
Class Classic
Engine
air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder
Bore / Stroke 82.0mm x 70.6mm
Compression ratio 5.8:1
Top Speed 114 mph (184 km/h)
Horsepower 50.02 HP (37.3 KW) @ 6200RPM
Torque 44.26 ft/lbs (60.0 Nm) @ 5000RPM
Air Filter K&N BM-0200[1]
Spark Plug NGK BP6ES
Battery YUASA YB18L-A
Transmission Gear box: 4-speed, manual

Final Drive: shaft

Clutch: dry, single plate
Suspension Front: telescopic fork
Rear: plunger shocks
Brakes Front: 200mm drum
Rear: 200mm drum
Front Tire 3.25-19
Rear Tire 4.00-18
Wheelbase 54.49 inches (1384 mm)
Length 82.99 inches (2108 mm)
Width 32.99 inches (838 mm)
Weight 210.0 kg (wet)
Oil Filter K&N KN-161[1]
Fuel Capacity 6.34 Gallon (24.00 Liters)
Manuals Service Manual

EngineEdit

A 81.3mm bore x 81.3mm stroke result in a displacement of just 745.0 cubic centimeters.

DriveEdit

The bike has a 4-speed, manual transmission. Power was moderated via the dry, single plate.

ChassisEdit

It came with a 3.25 S19 front tire and a 4.00 S18 rear tire. Stopping was achieved via 200mm drum in the front and a 200mm drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a plunger shocks. The wheelbase was 54.49 inches (1384 mm) long.

1969 - 1973 BMW R 75/5Edit

     

The 1969 MY BMW R 75/5 has, at its heart, an air-cooled, four-stroke, 745cc, boxer twin cylinder powerhouse paired to a five-speed manual transmission, and can produce a claimed 50 horsepower and 60 Nm of torque.

Standard fittings include laced wheels, a dual exhaust system, a dual seat, a small luggage rack in the rear, pillion grab rails, a large headlamp, full-fenders, a steel tubular frame, a telescopic front fork, plunger shocks as a rear suspension and a drum braking system.


1970 R75/5Edit

  • 1970 BMW R75/5 in Black

  • 1970 BMW R75/5 in Black

  • 1970 BMW R75/5 in Black

  • 1970 BMW R75/5 in Black

  • 1970 BMW R75/5 in Black

  • 1970 BMW R75/5 in Black

  • BMW R75/5 rear shock absorber


1972 R75/5Edit

 
1972 BMW R75/5



1973 R75/5Edit

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

  • 1973 BMW R-75/5 in Black

All slash-5 models have air-cooled, four-cycle, opposed-twin (boxer) engines with hemispherical combustion chambers. Their engine housings are one-piece tunnels housings. The camshaft, driven by a duplex chain, runs at half of the engine speed and is located below the crankshaft. This is the reverse arrangement from the /2 models and allows gravity to assist the delivery of oil to the camshaft. Valves are actuated by the camshaft through hardened followers, push rods, and rocker arms. The 500 cc and 600 cc models are equipped with Bing slide-type carburetors with 26 mm throats. The R75/5 comes with 32 mm Bing CV (Constant Vacuum/constant depression) type carburetors. As in all BMWs to the time, the clutch is a single-disk dry clutch. The slash-5s have four-speed transmissions and come with kick-starters as well as electric starters. The kick starters are less sturdy than on previous models and are a frequent point of failure, most often due to incorrect kick starting technique. They were intended for emergency use in the incident of an electrical failure. When properly tuned, a slash-5 can be started by operating the kick start lever with the hand, requiring very little force to start the engine. Final drive is by shaft, running from the transmission by universal joint to an oil bath within the right rear swing arm and connecting to a bevel gear and ring gear on the other end. Unlike the slash-2 models, the slash-5 models are equipped with telescopic front forks, 12-volt alternator and electrics, and standard tachometer and turn signals.

1976 R75/6Edit

  • 1976 BMW R75/6 in Blue

  • 1976 BMW R75/6 in Blue

  • 1976 BMW R75/6 in Blue


1976 R75/7Edit

 
BMW R75/7

After only three years BMW's '/6' line-up was replaced in the autumn of 1976 by the '/7'. The R90S-style fuel tank (adopted across the range) and redesigned rocker covers were distinguishing features while at the top of the range, 980cc R100 models replaced the '90' series. Offering, arguably, the best compromise of power and economy, the R75/7 turned in an impressive performance when tested back in 1977 by Bike magazine, which reckoned it was faster than its maker claimed. The big BMWs have always been consummate touring motorcycles and the R75/7 came fully equipped for the job, boasting 'a stainless disc that stops you in the wet, superbly comfortable riding position and well-damped long-travel suspension, over 250 miles on one tank of fuel, the brightest headlamp in the


In MediaEdit


ReferencesEdit

  1. ↑ 1.0 1.1 2019 K&L Supply Co Catalog. K&L Supply Co. 2019. 
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