Magnetic Speedometer Repair

Magnetic Speedometer Repair1

Magnetic Speedometer Repair

By Graham Blighe

The definitive guide to the repair and calibration of Smiths magnetic SSM speedometers and RSM tachometers

Fix it yourself and never have to pay or wait for repairs again. Instruments can be calibrated on bike or on an easy to build rig. Full instructions given every step of the way. No specialist tools required, just a cycle computer.

Also covers fault diagnosis, cable and drive gearbox maintenance and repair.

Unless a repair specialist asks you for the circumference of the rear tyre and ratio of the drive gearbox you are using, you are missing out on potentially greater accuracy that you can get by calibrating a speedometer yourself. Standard calibration gives an error of up to 5% with 1600 revs per mile instruments and sometimes more with 1000 revs per mile. This book shows you how to tailor the calibration for the machine the speedometer is used on and in most cases accuracy to within 2% can be achieved.

Watch the promotional video for this book on YouTube. The video shows some of the dismantling and calibration stages.

Many instruments will only need cleaning but this book also shows how to repair a shattered magnet, replace the upper bearing and fix an aluminium disc turning on its spindle. All repairs can be made at zero cost with the usual hand tools. Repair rather than replace with a part taken from a donor instrument and help all of us by preserving the stock of these instruments.

Read the review at the RealClassic website.

Colour covers, B&W interior. 7.4x9.7 inches. 84 pages. 16,500 words. 57 illustrations. First published July 2009

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