1981 gl1100 fuel issue!


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Mdyson4
Posts: 4
Joined: Tue Aug 06, 2019 11:43 am
Location: Charlotte
Motorcycle: 1981 1981

1981 gl1100 fuel issue!

Post by Mdyson4 » Tue Sep 17, 2019 7:19 pm



I bought a bike that wasn’t running as a project. I discovered the crank was full of fuel, drained it, replaced the oil&filter and it cranked right up!! But ran rough. Rebuilt the carbs (found totally clogged idle jets), adjusted the floats and now it doesn’t leak gas into the crank when it’s off, but it consumes a ridiculous amour is gas (a 16oz Gatorade bottles worth in a minute or two) and runs great for a few seconds, then terrible. Gas is being somehow thrown into the crank and I’m assuming fouling plugs etc. what could it be?!? I’ve checked to make sure I didn’t forget to put a needle back in.. etc. but I’m super frustrated cause I feel like I must be missing super dumb. I’ve done a lot of searching online and most people say floats... but I’ve adjusted them well. Any thoughts?!



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DenverWinger
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1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
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Re: 1981 gl1100 fuel issue!

Post by DenverWinger » Tue Sep 17, 2019 10:16 pm

Could be the fuel pump. Normally when the mechanical fuel pump springs a leak it comes out the weep hole and drips on the ground. But they can leak internally, too, and you'll have fuel running down the pump actuator lever, into the fuel pump mount, thru the right head and ultimately into the crankcase.

Unbolt the fuel pump from the "elbow" the pump mounts to, and with the fuel lines connected work the pump lever by hand and see if the pump is leaking. You can also look into the "elbow" and see if there's evidence of it being nicely washed by gasoline.
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dingdong
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Re: 1981 gl1100 fuel issue!

Post by dingdong » Wed Sep 18, 2019 7:22 am

Did you check and set the float adjustment? They have to be adjusted to the exact correct level. Close doesn't count with these carbs. There is also a possibility that the float valves are bad and leaking.
Tom

"Molon Labe"

John F. Kennedy would be impeached by todays liberal Democratic socialist party.

indianakid
Posts: 221
Joined: Sun Sep 26, 2010 5:28 pm
Location: long beach, ca
Motorcycle: 83 GL1100 I

Re: 1981 gl1100 fuel issue!

Post by indianakid » Thu Sep 19, 2019 10:13 am

check the air cut off diaphragms. if they are leaking it will draw fuel from the idle circuit side directly into the intake tube and will not allow the idle circuit to work. also verify that the two air jets that feed the idle circuits (each carb) are clean.



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