Download BMW 2-Valve Twins Owners Workshop Manual 1970-1993 473cc, by Jerry Churchill PDF

By Jerry Churchill

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Read or Download BMW 2-Valve Twins Owners Workshop Manual 1970-1993 473cc, 498cc, 599cc, 649cc, 745cc, 797cc, 898cc and 979cc (Haynes Manuals) PDF

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Additional resources for BMW 2-Valve Twins Owners Workshop Manual 1970-1993 473cc, 498cc, 599cc, 649cc, 745cc, 797cc, 898cc and 979cc (Haynes Manuals)

Example text

If no improvement is obtained, try one grade hotter plug Wet, oily carbon deposits form an electrical leakage path along the insulator nose, resulting in a misfire. The cause may be a badly worn engine or a malfunctioning ignition system A blistered white insulator or melted electrode indicates overadvanced ignition timing or a malfunctioning cooling system. If correction does not prove eftective, try a colder grade plug A worn spark plug not only wastes fuel but also overloads the whole ignition system because the increased gap requires higher voltage to initiate the spark.

If a white plastic cap is fitted to the contact breaker assembly or is supplied with it, the cap should be discarded as it is not intended for use on these machines and will restrict engine performance at high engine speeds. To adjust the contact breaker gap, rotate the engine clockwise as described above until the maximum gap is obtained and measure the gap using feeler gauges which should be a light sliding fit. Note that the gap should always be checked with the outrigger bearing plate in place.

Remove any small stones or other road debris caught between the treads. When checking the tyres for damage, they should be examined for tread depth in view of both the legal and safety aspects. It is vital to keep the tread depth within the UK legal limits of 1 mm of depth over three-quarters of the tread breadth around the entire circumference with no bald patches. 12 in) for speeds above 80 mph (130 km/hJ, measured at the centre of the tread. If new tyres are to be fitted, they must be of the correct size and speed or load rating, as listed in the Specifications Section of Chapter 8.

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