Weber carb conversion


Information and questions on GL1100 Goldwings (1980-1983)
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RMBLOldwinger
Posts: 4
Joined: Wed Aug 09, 2017 7:36 pm
Location: Paragould, Arkansas
Motorcycle: 1983 GL1100 Interstate

Weber carb conversion

Post by RMBLOldwinger » Wed Aug 09, 2017 7:55 pm



Hello one and all! I appreciate being here. I recently bought a 1983 GL1100 Interstate and just can't leave well enough alone. The bike has sat for awhile and even though it starts and runs, the carbs are in dire need of attention. At any rate, I am ditching the Keihins and installing a set of spanking new Weber 40IDF's. My problem is that an electric fuel pump is recommended and I have not been able to find one specific to the GL1100. Does anyone here have an idea what might work in this situation? Many thanks!



jameselindorff
Posts: 6
Joined: Wed Nov 09, 2016 5:00 pm
Location: Austin, Minnesota
Motorcycle: 1985 GL1200I

Re: Weber carb conversion

Post by jameselindorff » Wed Aug 09, 2017 11:33 pm

Hello: since these were popular fits on VW s you could probably use a 12v electric pump that would fit their application. My memory fails me on the details "of the day" but I'm sure they were low pressure pumps. Beck Arnley used to sell an inexpensive pump that was suitable and small with a mounting bracket. Best wishes

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Maz
Posts: 399
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200

Re: Weber carb conversion

Post by Maz » Thu Aug 10, 2017 2:30 am

I've been told that a Yamaha FJ1200 electric pump will work. They're cheap too!
Maz
Nostalgia is not what it used to be!

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brianinpa
Posts: 50
Joined: Thu Mar 25, 2010 7:13 pm
Location: Lebanon, PA
Motorcycle: 1984 GL1200 Standard
1987 GL1200 Interstate

Re: Weber carb conversion

Post by brianinpa » Thu Aug 10, 2017 9:17 am

The fuel pump for an 84 Honda Accord is almost a direct match for the 1200, so it will work with an 1100 as well.
Brian

If you aren't having fun doing it, find something else to do.

RMBLOldwinger
Posts: 4
Joined: Wed Aug 09, 2017 7:36 pm
Location: Paragould, Arkansas
Motorcycle: 1983 GL1100 Interstate

Re: Weber carb conversion

Post by RMBLOldwinger » Thu Aug 10, 2017 11:43 am

Thank you all so much for your excellent responses! I will update when the project is finished.

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Mh434
Posts: 1098
Joined: Tue Mar 25, 2014 10:24 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1997 gl1500 SE
Previous:
1981 GL1100I
1989 Kawasaki Concours

Re: Weber carb conversion

Post by Mh434 » Sat Aug 12, 2017 3:12 pm

Just make sure it's a low-pressure pump. Webers typically don't like more than 2-3 psi pressure.

RMBLOldwinger
Posts: 4
Joined: Wed Aug 09, 2017 7:36 pm
Location: Paragould, Arkansas
Motorcycle: 1983 GL1100 Interstate

Re: Weber carb conversion

Post by RMBLOldwinger » Sat Aug 12, 2017 9:16 pm

Good to know. Thanks much!

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RBGERSON
Posts: 2884
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Weber carb conversion

Post by RBGERSON » Sun Aug 13, 2017 7:25 am

I'd try it with the pump on the bike now..it pumps at 2-3lbs. But Any electric pump that pumps at 2-3lbs. should work just fine. Many install an electric pump right where the mechanical pump was mounted.you just need to fab a face plate for the end of the tach housing..don't forget a auto shut off circuit..based on the bikes attitude..IE if it goes down..the pump shuts off. I think the reason they spec a pump at all is that many bikes didn't have pumps they were all gravity fed..now-a-days not so much..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

RMBLOldwinger
Posts: 4
Joined: Wed Aug 09, 2017 7:36 pm
Location: Paragould, Arkansas
Motorcycle: 1983 GL1100 Interstate

Re: Weber carb conversion

Post by RMBLOldwinger » Sun Aug 13, 2017 10:59 am

The primary reason that the electric pump is used is to shorten start time. Weber 40IDF's do not employ a choke circuit, so the start is done the old fashioned way.....pump the throttle a few times. The electric pump will fill the bowl without cranking the engine over, where the mechanical pump will not. This particular conversion is Gold Wing specific, so I am sure the mechanical pump was taken into consideration. I really appreciate the mention of the "auto shut-off" switch, because it had not yet occurred to me. That could, indeed, be a life saver. There are a lot of "Deep Thinkers" on this site, and I very much appreciate all of the excellent input.

I have been messing about with old bikes for many years now, particularly old Hondas, and one of my major frustrations has been the factory carbs (Keihins) on the bikes. Anytime that it is feasible I replace them with Mikunis. My recent experience with a 78 CB750 Supersport is a great example. I fiddled and fussed with the Keihins for a good three months and was never able to get them sorted out. After discovering a set of racked up Mikuni flat slides, which were pre-jetted and ready to go, I just had to have them. The difference was nothing short of amazing. I had a similar experience when I replaced the 28mm Keihin with a 36 Mik. If I could put Mikunis on the Wing, I would, but the cables would be a nightmare. The Weber conversion is not a "perfect for everyone" conversion, because it changes the riding dynamics, but after reading all of the available information on it, I felt it would work for me. It is amazing how many wacky ideas begin to make perfect sense once one cracks the "70" mark (years, that is).



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