rich smell when decelerating.


Information and questions on GL1200 Goldwings (1984-1987)
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feetup
Posts: 100
Joined: Mon Jun 29, 2009 1:15 pm
Location: West Coast of Canada
Motorcycle: 84 GL 1200I
75 GL 1000 (in pieces)
'02 Gas Gas Trials
'56 Norton 600

rich smell when decelerating.

Postby feetup » Thu Aug 09, 2012 3:35 pm



My 84 inter. runs flawlessly, starts without choke if the weather is not too cold, no hesitation and idles smooth when the throttles are balanced.
It does however smell strongly of half burned fuel when decelerating with the throttle closed.
I haven't had the carbs out yet, and I haven't adjusted the idle screws although the PO may have.
Is this common for the 1200's or do I have an issue with carbs or air cutoff valve or purge valves. This is not a California spec bike.



rdraidr
Posts: 75
Joined: Fri Aug 19, 2011 7:02 am
Location: Roswell, New Mexico
Motorcycle: 1987 GL1200A

Re: rich smell when decelerating.

Postby rdraidr » Wed Oct 10, 2012 10:45 pm

Did you ever get an answer to your question? I'm not sure how you know that you are getting a rich smell when only decelerating. Otherwise, we both have a similar issue. Do you get any backfires; cold, decel?

The air cutoff valve is interesting. Is that only on Cal-spec models? I've checked everything else I know to check on mine.

User avatar
feetup
Posts: 100
Joined: Mon Jun 29, 2009 1:15 pm
Location: West Coast of Canada
Motorcycle: 84 GL 1200I
75 GL 1000 (in pieces)
'02 Gas Gas Trials
'56 Norton 600

Re: rich smell when decelerating.

Postby feetup » Thu Oct 11, 2012 3:16 pm

The consensus of opinion seems to be the air cutoff valve, mounted on the bottom of the plenum chamber.

I have found, since I posted, that if I decelerate with the throttle completely shut I don't notice any smell, but if I decelerate with the throttle slightly open, I can smell the unburned fuel/very rich smell.

It has been sugested that I might have a sticky slide, although I haven't checked.

I have planned to do a carb rebuild this winter, even though the bike runs very well. Actually that was in my plans for last year but never happened.

Ghostrider52005
Posts: 124
Joined: Sun Dec 20, 2009 7:19 pm
Location: Olive Hill Kentucky
Motorcycle: 1985 GL 1200 LTD, 1984 GL1200 Interstate, VS 700 Suzuki Intruder.

Re: rich smell when decelerating.

Postby Ghostrider52005 » Fri Oct 12, 2012 2:05 am

Not sure it would be a sticky slide since if the slide is sticking open slightly the bike should run rich at idle also since the main jet would be being held open somewhat at idle flooding that cylinder though I suppose its possible if the slide actually falls all the way down at idle.




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