Question about 1990 BMW K 100
Sounds like one or more of the floats in the carbs is not seating? No. Wrong. The K-100 is a fuel injected motorcycle.
Fuel is fed from the tank under pressure from an internal fuel pump-where it is fed from the left front of the tank to a fuel rail, the unused fuel is returned to the rear of the tank through a second hose. The first thing to check is that both clamps are snugged down, if the engine still stalls check the fuel rail pressure - the regulator may be out of whack allowing too much pressure to build up in the rail causing an excessively rich mixture.
I had the exact problem with my 88 K-100RT, the supply hose was found loose, snugging the hose down at the tank solved the problem. It also highlighted a condition; the hoses had deteriorated in the 20 years I had the bike, so I replaced both of them-none too soon either. This fuel system carries fuel under pressure, and although the leak seemed to cause the fuel pump to shut down after about 20 seconds - spraying fuel on a hot engine is a vary dangerous condition, to both you and and your motorcycle.
Posted on Jan 16, 2009
Sounds like one or more of the floats in the carbs is not seating, allowing the fuel to overflow the carbs. This would likely mean there is some trash or varnish in the float bowl. But, of course, there is a possibility that a fuel or vacuum line is leaking or has become disconnected. See, the fuel tap, also called the petcock, when it's set on "RUN" or "ON" only flows fuel when the motor is supplying vacuum to it. You may be able to switch it to "PRI" (Prime) and then find where it's leaking from. This way you don't even have to run the motor to get the fuel to flow. Good luck, keep us posted.
Posted on Nov 20, 2008
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