Question about BMW R 1150 R Motorcycles

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When you fill the gas tank the engine is very hard to start and will only run at 2000 rpm or higher once you get it started. It will not idle. After some of the fuel is used the fuel filler cap is sucked very tight to gas tank. Bike year is 2004 US bike. 19500 miles on odometer. After maybe a gallon of fuel is used you can relieve the sucked down gas cap by opening it and then the bike will idle if needed until the cap sucks tight again.

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You definitely need a new fuel tank cap. Your motorcycle gas tank is designed not to release gasoline into the atmosphere . But it is designed to allow air into the tank so the fuel will flow. If you have a vacuum forming in the tank your fuel tank gas cap is not venting air into the tank. Unless your gas tank cap can be taken apart and is rebuildable , you will have to buy a new one to fix the problem.

Posted on Oct 13, 2010

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Posted on Jan 02, 2017

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1 Answer

High Idle at Start Up


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Hello, my car has sat for about 8 months, 4 months into it, I started it up and once the engine warms up, the idle begins to fluctuate between 1100 and 2000 rpm, up and down up and down it does not do this...


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1 Answer

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