K1 brake light doesn't work - K-Bikes.com - Excellence in Motion
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post #1 of 3 (permalink) Old Apr 17th, 2011, 11:42 pm Thread Starter
Join Date: Sep 2006
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K1 brake light doesn't work

My 1990 BMW K1's brake light doesn't work. Both foot and hand levers
don't trigger it to work. I checked the two bulbs in the tail-light and they
both checked out. I checked the fuses, they're all good. Any ideas where
to check next? Please help, I don't want to see "lights flashing" in my mirrors!
Also, I need to know the spark plug size. My K1 back fires and the exhaust
smells like unburnt fuel.
davanyo is offline  
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post #2 of 3 (permalink) Old Apr 18th, 2011, 7:30 pm
chaos's Avatar
Join Date: Jun 2008
Location: Moraine, OH, USA
Posts: 305
The little plunger switches on the brake levers go bad. Unlikely both would go out the same time but it's possible. Test it by unplugging the switch and jumping the contacts-if the brake lite works the switch is bad.

#4 in the illustration, same switch front and back. Pricey little bugger!

The OEM spark plug is the Bosch X5DC
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1987 RED K75S
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post #3 of 3 (permalink) Old Apr 19th, 2011, 8:03 am
PsyKotic Waterfowl
Join Date: Aug 2006
Location: Seattle, WA,
Posts: 1,328
A K1 won't have a piston switch for the rear brake. Only the early Ks had those. The rear brake switch will be a #10 in that diagram.
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