BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


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

jahearne

avatar
active member
active member
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

avatar
Life time member
Life time member
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.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

3Back to top Go down    Re: Throttle Bodies on Sun Aug 05, 2018 3:20 am

jahearne

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


__________________________________________________
†- John
    

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

charlie99

avatar
VIP
VIP
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


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

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

jahearne

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


__________________________________________________
†- John
    

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

jahearne

avatar
active member
active member
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


__________________________________________________
†- John
    

7Back to top Go down    Re: Throttle Bodies on Wed Sep 19, 2018 2:00 am

jahearne

avatar
active member
active member
She fired right up on first attempt. Next week, sync throttle bodies, adjust throttle position, etc.


__________________________________________________
†- John
    

8Back to top Go down    Re: Throttle Bodies Yesterday at 9:33 pm

jahearne

avatar
active member
active member
Everything works great except I can't get the idle to rest on the idle stop screw. Idling around 1200 to 1400 rpm. It seems (after taking it apart for the 5th time) that the choke/fast idle is preventing the throttle from settling all the way down on the idle screw. The choke mechanism appears to be resting on the its stops, but the throttle shaft components are still resting on the fast idle cam just enough to crack it open up to 1200+ rpm. Easier to explain with some pictures, but I can barely get my hand in there... all this stuff sits between the throttle position switch and pressure regulator. At least I know what the problem is the next time I tear it apart.


__________________________________________________
†- John
    

9Back to top Go down    Re: Throttle Bodies Yesterday at 9:44 pm

duck

avatar
Life time member
Life time member
Try loosening and adjusting the throttle position sensor. Sometimes that will hold the throttle open. Also check the positioning of the hose clamps below the TBs.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

10Back to top Go down    Re: Throttle Bodies Yesterday at 10:45 pm

robmack

avatar
Life time member
Life time member
TB clamps should be positioned like this:



One thing I had to do on my actuator was this:


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum