Carburation problem on 1984 GL1100


Information and questions on GL1100 Goldwings (1980-1983)
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bsag14
Posts: 7
Joined: Fri Jan 29, 2010 11:57 am
Location: Cirencester, UK
Motorcycle: 1984 GL1100

Carburation problem on 1984 GL1100

Postby bsag14 » Mon Dec 20, 2010 4:38 pm



Recently acquired GL1100 Interstate with poor idle, identified as no. 4 cylinder not firing correctly. Checked ignition and spark, all OK. Dismantled carburetors, cleaned all jets etc. and fitted new o-rings as necessary. Reassembled and started bike. Result is lean burn on 3 cylinders and no no.4
Dismantled carburettors again, and noted all floats were out of alignment according to the manual, i.e. not 15.5 mm from top of bowl, with no.4 particularly out. Adjusted all float levels to 15.5mm setting. Changed fuel filter and checked mechanical fuel pump for operation - all OK.
Attempted to start bike - will not run at all.
One point - float levels appeared to be higher than specified, not lower. Thus adjustment appears to lower fuel level in the bowl, rather than increase the level.
Would appreciate any advice on where to look for potential causes.



User avatar
virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carburation problem on 1984 GL1100

Postby virgilmobile » Tue Dec 21, 2010 3:39 pm

When i cleaned my carbs I noted at what point the floats would rest shut when I tilted the assembly.I found that they were level with the carb body.If you're not sure about measuring at least set the floats where they rest closed at the point that they are level with the casting.Tilt the assembly back and forth to see where they rest at.It's important that each carb has the same amount of fuel in each bowl.It will take a bit of cranking to get the carbs re-fueled after install.I prefer to mechanically set the throttle plates the same before install and then vacuum ssync.See the crude drawing.Don't forget the air cutoff valves.Virgil
ps.yes the floats can be installed upside down(i did that once)It wont work.cuts off all the fuel.

User avatar
virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carburation problem on 1984 GL1100

Postby virgilmobile » Tue Dec 21, 2010 3:41 pm

sorry,here's the pix
Attachments

bsag14
Posts: 7
Joined: Fri Jan 29, 2010 11:57 am
Location: Cirencester, UK
Motorcycle: 1984 GL1100

Re: Carburation problem on 1984 GL1100

Postby bsag14 » Sun Jan 30, 2011 2:56 pm

virgilmobile wrote:When i cleaned my carbs I noted at what point the floats would rest shut when I tilted the assembly.I found that they were level with the carb body.If you're not sure about measuring at least set the floats where they rest closed at the point that they are level with the casting.Tilt the assembly back and forth to see where they rest at.It's important that each carb has the same amount of fuel in each bowl.It will take a bit of cranking to get the carbs re-fueled after install.I prefer to mechanically set the throttle plates the same before install and then vacuum ssync.See the crude drawing.Don't forget the air cutoff valves.Virgil
ps.yes the floats can be installed upside down(i did that once)It wont work.cuts off all the fuel.

Many thanks for your advice. I decided to buy a set of new jets, gaskets etc., and rebuilt the carbs.
Apart from idle adjustment, it now seems to be running OK.
Phil




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