BMW R90S
The BMW R90S is a motorcycle that was produced by BMW between 1973 and 1976. It was based on the R75/5, but had a number of upgrades, including a more powerful engine, a five-speed gearbox, and a new frame. The R90S was also the first BMW motorcycle to be equipped with a fairing.
The R90S was a popular motorcycle, and it helped to establish BMW as a leading manufacturer of performance motorcycles. It was also a successful racing motorcycle, and it won a number of races, including the 1976 Daytona 200.
**Engine**
The R90S was powered by a 898 cc air-cooled flat-twin engine. The engine had a bore and stroke of 90 mm x 70.6 mm, and a compression ratio of 9.5:1. The engine produced 67 horsepower at 7,000 rpm, and 59 pound-feet of torque at 5,500 rpm.
**Transmission**
The R90S was equipped with a five-speed gearbox. The gearbox had a helical-cut gearset, and it was designed to provide smooth and precise shifting.
**Frame**
The R90S had a new frame that was designed to be lighter and stiffer than the frame on the R75/5. The frame was made of tubular steel, and it had a double-cradle design.
**Suspension**
The R90S had a telescopic fork front suspension and a swingarm rear suspension. The front suspension had a travel of 120 mm, and the rear suspension had a travel of 100 mm.
**Brakes**
The R90S had a single disc brake on the front wheel and a drum brake on the rear wheel. The front brake had a diameter of 260 mm, and the rear brake had a diameter of 200 mm.
**Wheels and Tires**
The R90S had cast alloy wheels. The front wheel was 19 inches in diameter, and the rear wheel was 18 inches in diameter. The tires were tubeless, and they had a size of 3.25-19 on the front and 4.00-18 on the rear.
**Dimensions**
The R90S had a length of 2,180 mm, a width of 820 mm, and a height of 1,120 mm. The seat height was 800 mm, and the ground clearance was 160 mm. The dry weight of the R90S was 216 kg.
**Performance**
The R90S had a top speed of 124 mph, and it could accelerate from 0 to 60 mph in 4.5 seconds. The R90S was also a very fuel efficient motorcycle, and it could get up to 50 mpg.
**Conclusion**
The BMW R90S was a landmark motorcycle. It was the first BMW motorcycle to be equipped with a fairing, and it was also one of the first BMW motorcycles to be designed for performance. The R90S was a popular motorcycle, and it helped to establish BMW as a leading manufacturer of performance motorcycles.
This is the COMPLETE official BMW /6 service manual by BMW for the R90S R90/6 R90 R90S/6 R90/6 R 90 Slash 6 R60/6 R75/6. ALL Production model years of these models, factory manual. Hundreds of pages allow you to print it out in its entirety or just the pages you need!!
These BMW R90S service manuals are your number one source for repair and service information. They are specifically written for the do-it-yourselfer as well as the experienced mechanic. Using this BMW R90S service manual is an inexpensive way to keep your equipment working properly. Each BMW R90S service manual provides step-by-step instructions based on the complete disassembly of the machine. It is this level of detail, along with hundreds of photos and illustrations, that guide the reader through each service and repair procedure. Simply print out the pages you need or print the entire BMW /6 service manual as a whole!!!
* Detailed substeps expand on repair procedure information.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Numbered instructions guide you through every repair procedure step by step.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.
* Numbered table of contents is easy to use so that you can find the information you need fast.
This BMW R90S service manual also makes it easy to diagnose and repair problems with your machines electrical system! Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
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