BMW K100 LT Bedienungsanleitung PDF herunterladen (Seite 22)

volts are produced at the high voltage terminal, not enough to actually cause a spark.

The actual spark is generated when the breaker contacts open.

Much smaller coils are used and in the case of the K100. One coil is servicing two

spark plugs (These coils put off about 20kv). It is called a wasted spark system. In this

arrangement the coil generates two sparks per cycle to both cylinders. The fuel in the

cylinder that is nearing the end of its compression stroke is ignited, whereas the spark

in its companion that is nearing the end of its exhaust stroke has no effect. The wasted

spark system is more reliable than a single coil system with a distributor. Coils

contained in a single moulded block with multiple high-tension terminals are

commonly called a coil-pack.

On a K100 coil, the resistance measured between the 2 high voltage terminals is about

12.6KΩ and the primary coil should measure about 2.6 Ω.

What could go wrong with a coil?

You may find a cut in the winding, burnt insulation, crack in the casing or corroded

connections. Your best friend is the Ohmmeter and a visual inspection at night to

locate a crack. A spark will travel along the crack and will be visible in the dark.

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BMW K100 LT Bedienungsanleitung Seite 22