BMW K100 LT Bedienungsanleitung PDF herunterladen (Seite 8)

Idle switch

The idle switch (Also called butterfly switch or throttle switch) is located at the end

of the fuel injector rail. It wills cut-off the fuel injector when releasing the throttle.

With this system, when decelerating (switch 1 close), the fuel injection is disabled

until the rpm goes down to 2000rpm. If the engine is still decelerating and the rpm

is lower than 2000, the EFI is re-enabled and the injection is controlled again by the

FI computer. As an example, when riding at 5000rpm and cutting the throttle, the

injection will be cut off between 5000 and 2000rpm. (This is one of the reason why

the K100 really slow down when you shut down the throttle.)

This switch assembly only signals idle or full throttle to the EFI. Mid throttle signal

to the EFI was controlled by the vacuum switch. This switch has been removed in

the late 1985)

A good indication of a bad setup is when the engine backfires when decelerating.

When you twist the throttle, the same switch (contact # 2) will tell the EFI computer

that the engine is on full load and the mixture air/fuel will be enriched

IF the bike doesn't start and you suspect the fuel injection, try to start the engine with

this switch disconnected. A bad switch may send a wrong signal to the EFI computer.

When this switch is disconnected, the EFI thinks that you are twisting the throttle.

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BMW K100 LT Bedienungsanleitung Seite 8