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1Back to top Go down   Air Leak Issue - Rubbers Empty Air Leak Issue - Rubbers on Sun Feb 02, 2020 2:43 am

GF Wollongong

GF Wollongong
Platinum member
Platinum member
K100RS 1984

Got an air leak somewhere which I think is rubber related.

Z hose checked
Air filter Box to plenum - recently replaced large connecting rubber hose
Manometer blanking rubbers good
Have tried the Propane / WD 40 / Degreaser spray at the base of the throttle body to engine rubbers - no change
Fuel Injector o-rings and filters recently replaced.
Fuel hoses replaced (internal and external)


I'm thinking (speculating) it's rubber related (and sucking air) because once the engine has run for 20 mins, the idle speed is different (usually faster and is sitting at the 950rpm). I remember way back when I first got my car license, that squealing fan belts will heat up and expand when hot and squeal may well go away.

Any suggestions?

Thanks

GF

    

2Back to top Go down   Air Leak Issue - Rubbers Empty Re: Air Leak Issue - Rubbers on Sun Feb 02, 2020 5:29 am

Dai

Dai
Life time member
Life time member
Only one I can see missing from that list, Guy; plenum chamber to throttle bodies?


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

3Back to top Go down   Air Leak Issue - Rubbers Empty Re: Air Leak Issue - Rubbers on Sun Feb 02, 2020 6:50 am

GF Wollongong

GF Wollongong
Platinum member
Platinum member
Thanks for the reply

Will check once some much needed rain clears

Seems to be sucking air creating an irregular idle. But once it's fully warm it's running a lot better.

When I put the manometer (about 2mths ago) onto it I was not getting much response from #4 screw. So I zeroed them all in and then out 1.5 turns. Air filter to plenum had a crack, z hose was slightly kinked (an now fully correct). 

Had a thought to:
Remove and flatten the base of the the throttle body to engine rubbers with some fine wet and dry paper over a sheet of glass.
Then wipe some sealer (adhesive silicone or something similar and suitable) under and around the rubbers. 

Still, had a pleasant ride today (National Park south of Sydney) - especially after the same police highway patrol car (Chrysler 300) that busted me 2 days before I went to India for a month, pulled a quick u-turn and followed me (don't think I was speeding) for about 1km before another motorcycle sped past in the opposite direction and took his attention. 

Regards

GF

    

4Back to top Go down   Air Leak Issue - Rubbers Empty Re: Air Leak Issue - Rubbers on Sun Feb 02, 2020 7:48 am

duck

duck
Life time member
Life time member
At least in my experience, if anything is leaky below the TB it makes it difficult to sync a TB that has a leak below it.

Since it seems to run better once heated up then try the manometer when running cold and then compare to when warm to see how that differs.


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
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