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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » 1985K100RS. Oily film on throttle bodies 3 and 4.

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RS Rider

RS Rider
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This year, I noticed an oily film around the Oetiker clamps and throttle body rubbers on throttle bodies 3 and 4 between the plenum and throttle body. It is not present on numbers 1 and 2. They were all replaced 3 winters ago with new clamps. I balanced my throttle bodies earlier this year with zero issue and am having absolutely no performance issues and have a rock-solid idle. Because of that, I have not bothered yet to spray anything to check for air leaks. Am I looking at possible cracked or split rubbers?

Thanks,
Tom

    

92KK 84WW Olaf

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I suspect your Z pipe is blowing. Check it out first.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 49,200 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

RS Rider

RS Rider
Gold member
Gold member
92KK 84WW Olaf wrote:I suspect your Z pipe is blowing. Check it out first.


Maintenance this past winter included removing it for inspection and it was in great condition. It was a replacement 3 years ago, too. I'll check it again. I do carry a spare.

    

Laitch

Laitch
Life time member
Life time member
Why not just wipe off the oily film and enjoy what you are describing as an excellent ride? You can always take time-lapse photos of its development for your journal. Smile  Otherwise, a little oily film could possibly serve as a theft-deterrent. Who knows?


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1995 K75 90,000 miles
    

Dai

Dai
Life time member
Life time member
Z-pipe - I hate that thing. I just made one from a Guzzi breather pipe and the elbow and first inch of a breather pipe I removed from a Triton recently. Push two parts together, seal with self-amalgamating tape and (hopefully) forget it for good because the wall thickness of the two pipes is about 2.0mm.


__________________________________________________
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
    

Laitch

Laitch
Life time member
Life time member
Dai wrote:Z-pipe - I hate that thing.
1985K100RS. Oily film on throttle bodies 3 and 4. Centre10
Laughing


__________________________________________________
1995 K75 90,000 miles
    

Dai

Dai
Life time member
Life time member
Laitch - that one just went whoosh! and removed another chunk of hair around my bald patch.


__________________________________________________
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
    

RS Rider

RS Rider
Gold member
Gold member
I removed the breather pipe and it was perfectly fine. As I am having no performance issues, further inspection will now wait until the end of the riding season, which will include inspection of the rubbers between the plenum and throttle body on cylinders 3 and 4. I'll also source reusable clamps at that point, too.

    

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