Carb question.


Information and questions on GL1100 Goldwings (1980-1983)
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DCoxson1969
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Joined: Wed Jul 22, 2009 12:35 pm
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Motorcycle: 1981 GL1100 Interstate

Carb question.

Postby DCoxson1969 » Wed Apr 13, 2016 7:06 am



I am having a problem with fuel getting past the carb and into one of the cylinders on the left side. If I leave the petcock on while the bike is sitting, it hydrolocks. What part of the carb would be causing this? I have had them apart and cleaned but must have missed something. Any help would be appriciated.

Dave


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Maz
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Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
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1990 Yamaha FJ1200

Re: Carb question.

Postby Maz » Wed Apr 13, 2016 7:20 am

One way or another, fuel is getting past the float valve on that carb. Either the needle/seat is dirty or damaged (remove float needle and check/clean needle and seat) or the float height is wrong (measure and adjust) or the rubber 'O' ring under the brass valve seat is damaged (replace). The float may also be fouling on something (check for smooth movement and correct if fouling).
Hopefully one of these will sort it.
Maz
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DCoxson1969
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Motorcycle: 1981 GL1100 Interstate

Re: Carb question.

Postby DCoxson1969 » Wed Apr 13, 2016 7:25 am

Thanks Maz, that is somewhere to start.
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dingdong
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Re: Carb question.

Postby dingdong » Wed Apr 13, 2016 7:28 am

Most likely a defective float valve that isn't sealing. Another possibility is a float that is hanging up and not allowing the float valve to seal. If you didn't replace the float valves with OEM Honda you need to look there. In the meantime be sure to keep the petcock closed to prevent damage.
Tom

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DCoxson1969
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Joined: Wed Jul 22, 2009 12:35 pm
Location: United States
Motorcycle: 1981 GL1100 Interstate

Re: Carb question.

Postby DCoxson1969 » Wed Apr 13, 2016 7:38 am

Would this problem make the bike run like poop also?
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ekvh
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Motorcycle: 1977 gl1000

Re: Carb question.

Postby ekvh » Wed Apr 13, 2016 8:09 am

Yes it'll run rich, but the real danger here is a bent valve. I learned the hard way. It does happen. There are three ways it can leak, float valve is probably most common, but you may as well see what it needs first. You can chase your tail unnecessarily.

To find out where it's leaking from, most often float valves, plenum seal, or carb-to-plenum connection. If the carbs are still on the bike, on centre stand, turn fuel off, remove slides, so you can see in the throats from above, dry everything off. Cut a piece of newspaper or paper towel to fit the base of the plenum. Turn fuel on and see where it gets wet from first. If it's along the centre line of the plenum, it's the plenum seal. If not, if from one or more than one of the sides, it's either float valve or carb-to-to plenum seal. Turn fuel off, dry everything off, turn fuel on and watch the offending carbs slide opening with a flashlight. If it comes from the plenum side of the throat first, it's the seals, a thick oring between the carb body and plenum fuel rail. If from the brass jets, it's your float valves. If any of the seals sit a long time, they can shrink when drying. About a million to one chance that they will absorb moisture from the fuel and seal again, but they could temporarily.

Failure to remedy this and leaving the petcock on can and does bend crank rods.

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auctioneeral
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1981 GL1100 full dresser
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Re: Carb question.

Postby auctioneeral » Thu Apr 14, 2016 5:53 am

You can also pull carb rack sit on work bench. Get some kind of tank that you can connect fuel hose to fill tank book fuel line up to carb rack and sit tank above carb rack to let fuel run into carb rack and look for fuel leaks then. Also pick up carb rack and tilt left right to look for leaks.




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