1987 GL1200 Runs Lean and needs choke under 2000 RPM


Information and questions on GL1200 Goldwings (1984-1987)
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8780Rider
Posts: 2
Joined: Sat Aug 07, 2010 11:35 am
Location: Hayward, California
Motorcycle: 1987 GL1200 Aspencade
1980 GL1100 Goldwing

1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby 8780Rider » Sat Aug 07, 2010 11:49 am



I just got my 1987 Aspencade running full force, including changing plugs, clutch, battery and all that. Starts right up. I need to run 1/4 choke on and even after 2-3 bars of temp on the dash. Soon as I hit around 2000 RPM and open it up it really goes and has great acceleration, and doesn't need choke at higher RPM's. The bike did set in a garage for 3-5 years. I have run carb/fuel cleaner thru it (twice). One of the plugs when I pulled them out looked a little wet but that could be the choke causing that.

I have been told these bikes are "cold" but having to run with the choke on I can see the gas gauge going down as a drive it!

I'll check that fuse by the battery. Is Sea Foam something different than STP fuel system cleaner? I have not checked the fuel filter, still looking for that. Any other ideas?



lnash
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Joined: Wed Jul 21, 2010 7:48 pm
Location: Sylacauga, Alabama
Motorcycle: 1984 GL1200A

Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby lnash » Sun Aug 08, 2010 9:41 am

My 84 Aspencade did the same thing after I got it running. I had to pull the carbs off twice to get the low speed jets clean. It would run great at 1/3 to wide open throttle. It would spit and sputter till you cracked open the throttle more. I found out that Sea Foam would not cut the trash out of the jets. I took the jets out and put 135psi of compressed air behind them to blow the trash out.

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tricky
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Location: Canada

Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby tricky » Sun Aug 08, 2010 6:12 pm

Fuel filter is in front of the gas tank, follow the fuel line down under the petcock, the white cylindrical thing there on a bracket is the fuel filter.

snowy.vtwin
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'95 Shadow ACE 1100
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Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby snowy.vtwin » Mon Aug 09, 2010 2:50 pm

I have a similar situation that has seen some slight improvement after 16oz of seafoam thru the carb mixed a 1oz per gal. I also synced the carbs and am now starting a second round of seafoam treatment. My run to town begins with 6 miles of highway so I wind it up to 5K before shifting and otherwise 'open it up' now and then. I can run without the choke around town but it is smoother with the choke slightly on... otherwise it's more like a 'gurgling' sound in the exhaust. If it's not totally smoothed out at the end of this season I will pull the carbs and maybe send them in for a rebuild... or maybe first try blowing them out with a water pic and compressed air. I don't ride much in town with this bike and on the hwy the gas consumption is reasonable and it has lots of power.

If I end up rebuilding carbs I'm tempted by this ebayer.... $225 incl shipping seems like an awfully good deal for someone like myself who hasn't opened a carb for over 40 yrs... check item no. 170500019904 or the link below.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... MEWAX%3AIT

8780Rider
Posts: 2
Joined: Sat Aug 07, 2010 11:35 am
Location: Hayward, California
Motorcycle: 1987 GL1200 Aspencade
1980 GL1100 Goldwing

Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby 8780Rider » Thu Sep 02, 2010 10:01 pm

Thanks all. Did a 250 mile round trip, premium gas and two gas treatments.. runs better but still poorly at low speed/below 1800 RPM :ugeek: . Looks like it just sat toooo long to not have to take the carbs off and clean them right.

This is not going to be fun.. will the bike go out of tune by removing carbs?

snowy.vtwin
Posts: 25
Joined: Mon Aug 24, 2009 11:48 am
Location: Marquette, Michigan
Motorcycle: '85 GL1200A
'95 Shadow ACE 1100
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Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby snowy.vtwin » Fri Sep 03, 2010 7:41 am

I've had huge improvement by pulling the caps off the pilot mixture screws and backing them out a half turn. I just did this yesterday and while not yet perfect I am not done playing around yet. fwiw 1800 rpm seems to me like a time for downshifting anyway even on a smoothly running 1200.

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Mooseman
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Re: 1987 GL1200 Runs Lean and needs choke under 2000 RPM

Postby Mooseman » Sun Sep 05, 2010 5:01 pm

Had the same issues with my 86-A when I bought it. It had sat for several years. I finally had to pull the carbs and give them a good cleaning. The pilot jets were pluged on a couple of the carbs. The sea foam and MMO just didn't do it. Took a couple of shots of carb cleaner in the jet and blowing it out with compressed air. When I pulled the jets, the orface is very small and easy to see how they plug easly. Since then it runs like a charm. Hope this helps.
Mooseman


Enjoy the ride. They are all good, just some better than others.
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