BMW K bikes (Bricks)


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1Back to top Go down   Refitting throttle bodies Empty Refitting throttle bodies Thu May 30, 2024 7:58 pm

taube

taube
active member
active member
Hello,

I removed the throttle body+air plenum ensemble on my K100 for cleaning and inspection. The intake manifolds, I have kept bolted to the crankcase, as they appear in good condition.

Are there tips for re-seating the throttle bodies into the intake manifolds? I can align them and apply pressure onto the air plenum box to force them down but they won't go in far.

    

2Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 8:50 pm

Dai

Dai
Life time member
Life time member
The plenum chamber is a RRPITA to get back on. My method is to

- use silicon grease around the inlets
- position the plenum chamber over the TBs
- push it down as far as it will go and sit it as level as possible
- using a hefty 10mm blade screwdriver (or similar) between the frame and the plenum chamber, lever the plenum chamber down hard
- protect the frame with a piece of cloth if wanted.
- rear first, followed by the front


I find they go on with a nice noisy pop! if done this way and it leaves you in no doubt that they are sitting fully on the TBs.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 8:55 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Hi, I've moved your post from Technical Repair & Troubleshooting to Technical Repair & Troubleshooting - Engine & Transmission because it's specific to your question. You chose the generic header which doesn't help much later on if someone's researching.

Try using the Forum's Search Bar. I typed in "refitting airbox" and some direct answers popped up with what you're asking. See what others before you have experienced. 

In my experience it requires patience, the right angle, and some form of lubricant. I start with a beer for me, then move on to silicone or soap for the airbox to TBs.

"Refitting Airbox"



Last edited by Two Wheels Better on Thu May 30, 2024 9:28 pm; edited 1 time in total


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

4Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 9:15 pm

taube

taube
active member
active member
Thank you both

Is petroleum jelly a bad idea for lubricant? Or dawn dish soap?
I have silicon lubricant (not grease) but it's quite thin and doesn't help much.


__________________________________________________
Restoration project: 1988 BMW K100RS
Currently riding: 2019 Honda CBR300R
    

5Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 9:31 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I provided you with a link - in blue - in my previous post. Press on that and it'll take you to one that's pretty clear. I dunno about Petroleum Jelly but I've used a healthy blast of silicone spray to ease in refitting them. Dai's particular technique works.


__________________________________________________
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

6Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 9:46 pm

taube

taube
active member
active member
I see, in the link RT recommends a little bit of Vaseline, which is what I meant by petroleum jelly. Thank you.


__________________________________________________
Restoration project: 1988 BMW K100RS
Currently riding: 2019 Honda CBR300R
    

7Back to top Go down   Refitting throttle bodies Empty Re: Refitting throttle bodies Thu May 30, 2024 9:46 pm

duck

duck
Life time member
Life time member
Not sure if this is causing you issues but I temporarily zip-tie the wiring above out of the way to add clearance.

Refitting throttle bodies K75pa.ab.tb.73.plenumtop.bindingframe


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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