Fuel & Air System

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Hall of Wisdom

by Richard230 Published on 07-22-21 02:53 PM
f you are interested in reading a very long and detailed discussion regarding gasoline and its use in motorcycles, here is a link to an article that was just published by Motorcycle.com:https://www.motorcycle.com/features/everything-you-need-to-know-about-motorcycle-fuel.html
by Richard230 Published on 12-30-18 07:49 AM
While this article might not help owners of F800 models, it might just help owners of the F750/850 bikes some day.

by Richard230 Published on 08-19-18 05:03 PM
Here is a long video showing the step-by-step process, parts and tools needed for replacing the in-tank fuel filter without also needing to replace the expensive BMW fuel pump/filter assembly: https://www.youtube.com/watch?v=D4k7XOOV1uE&feature=youtu.be&t=2&utm_source=CyclePump+Press+-+August+19+2018&utm_campaign=CyclePump+Press+August+19+2018&utm_medium=email
by Adelwise Published on 08-22-17 12:36 PM
My 2007 ST developed a very extreme stalling problem like many others have experienced. Thanks to contributions to the F800 Riders Forum on two different threads I was able to fix it. I have been on a nearly 6000 mile road trip after the fix with the bike running perfectly. I want to share what I went through for others who might have the problem.

1. The bike would stall when I down-shifted, as I pressed the clutch and closed the throttle. This happened at all speeds and.....
by oldbritbiker Published on 03-08-15 10:03 AM
having come back from a sunday ride out, I stopped the bike got off to open the garage door, then went to start it and no start the bike cranked but wouldn't fire, I pushed the bike into the garage put battery on charge and went for a beer, next day started to investigate, soon discovered the fuel pump not running, so I by passed the fp controller, pump ran bike started.

left bike couple of months over winter, then took it to the garage for a new tyre, after tyre fitted bike wouldn't start.....
by boraaski Published on 05-22-13 11:11 AM
Recently, my 2007 F800 ST with 25,000 miles experienced a fuel pump failure. On one day, the bike worked perfectly. However the next day, it refused to start and made a strange, new, buzzy noise during the process. The noise was traced to the fuel tank and pump. Bypassing the fuel pump controller and powering the pump directly I was able to reproduce the buzzing noise. Interestingly, when I reversed the polarity and ran the pump backwards, it made the usual whirring noise. I suspect bad...
by Mokkybear Published on 08-29-12 05:36 AM
Some useful advice on how to bypass a faulty fuel pump controller here: http://www.hexcode.co.za/techinfo/electric-fuel-pump-controller
by Mokkybear Published on 09-30-10 07:46 AM
Rough idle and poor slow speed running can often be caused by a faulty idle air supply circuit.

With the throttle in the released/closed position, the throttle butterflies are fully closed and air supply to the engine is controlled by the idle actuator, which is sited at the base of the air box. Air is drawn from the air box, past the idle actuator valve, and into the throttle bodies just below the butterflies. If you turn the ignition on and, after the self test, turn it off again, you will....
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