BMW K bikes (Bricks)

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1Back to top Go down    Throttle Bodies on Sat Aug 04, 2018 10:03 pm

jahearne

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I was not able to sync the rear throttle body and found an air leak. When I first saw the intake manifolds, I thought there was an o-ring but I was mistaken. I havenít found a source for these other than over priced NOS or used ones more dried out and cracked than mine. Any ideas?

    

2Back to top Go down    Re: Throttle Bodies on Sat Aug 04, 2018 11:59 pm

robmack

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Are you talking about the TB bushings that are screwed to the engine block? Is this where the leak is occurring? If so, refit the bushings and use RTV gasket maker between the engine block and bushing.


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1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
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3Back to top Go down    Re: Throttle Bodies on Sun Aug 05, 2018 3:20 am

jahearne

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Itís that simple? Alright, no problem. Iíll refit them with RTV. Thanks!


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4Back to top Go down    Re: Throttle Bodies on Sun Aug 05, 2018 4:06 am

charlie99

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whilst doing that , the head mount bushes harden at the head interface . and often distort especially at one end where the castings detour around the surface

smooth off the head mount surface†of the rubbers †by rubbing them over a wet and dry covered firm flat surface until you get an even appearance

good luck


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5Back to top Go down    Re: Throttle Bodies on Sun Aug 05, 2018 4:23 am

jahearne

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Right, I can clearly see where the old surface is squished over. Thanks for the tip!


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6Back to top Go down    Re: Throttle Bodies on Fri Aug 17, 2018 10:02 pm

jahearne

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That worked out well. I used 600 grit wet/dry sandpaper on a flat surface to clean up the mounting surface if the TB intake boots and a little RTV. Clean up the throttle bodies and everything bolted up. Thanks again for the advice!

However, the air box boots are dried up and cracked. Found a source for new ones:
https://www.ascycles.com/BMW-Motorcycle-Parts-Fiche/K100RS-1985-89?id=51752&catID=11&catname=Engine#PartsTable


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