Carburetor problems


Information and questions on GL1100 Goldwings (1980-1983)
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wishbone63
Posts: 28
Joined: Sun Dec 11, 2011 9:59 pm
Location: Saint George, Utah
Motorcycle: 1983 Honda Goldwing interstate, Honda CRF 250F, Honda XR600R.

Carburetor problems

Postby wishbone63 » Sun Apr 03, 2016 2:12 pm



I have a problem with my 1983 GL1100. I had a set of good carbs on it and it ran fine from startup to normal riding. Then I put those carbs on another project bike to sell. Then I rebuilt a set of carbs I got off ebay with a randaak kit. After installing these carbs the bike runs great when warmed up but sputters and it sounds as though it is backfiring through the carbs when the engine is cold. I have no idea where to look. Any thoughts would be appreciated.



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virgilmobile
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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: Carburetor problems

Postby virgilmobile » Sun Apr 03, 2016 4:35 pm

It's a lean condition.Either from a vacuum leak around the mounting "O" rings or fuel starved.

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wishbone63
Posts: 28
Joined: Sun Dec 11, 2011 9:59 pm
Location: Saint George, Utah
Motorcycle: 1983 Honda Goldwing interstate, Honda CRF 250F, Honda XR600R.

Re: Carburetor problems

Postby wishbone63 » Sun Apr 03, 2016 7:00 pm

Thanks virgilmobile.
Could it be caused by improper float adjustment? I will see if I can detect a air leak first. Also could the air screws have anything to do with it?

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virgilmobile
Posts: 7646
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: Carburetor problems

Postby virgilmobile » Sun Apr 03, 2016 8:00 pm

The floats absolutely must be set exactly right.Just a few mm.will change the mix ratio.
I usually set the idle jets the same to start then tweak them after the sync as per the "idle down" method.

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robb
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Location: Lexington, North Carolina
Motorcycle: 1989 Honda GL1500 Aspencade

Re: Carburetor problems

Postby robb » Sun Apr 03, 2016 8:39 pm

Could be a sync problem also, one lean carb can cause a ruckus.

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virgilmobile
Posts: 7646
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: Carburetor problems

Postby virgilmobile » Sun Apr 03, 2016 8:48 pm

Yea,I guess Im assuming a carb sync was done when the carbs were put on the bike.

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wishbone63
Posts: 28
Joined: Sun Dec 11, 2011 9:59 pm
Location: Saint George, Utah
Motorcycle: 1983 Honda Goldwing interstate, Honda CRF 250F, Honda XR600R.

Re: Carburetor problems

Postby wishbone63 » Sun Apr 03, 2016 10:49 pm

I did do a carb sync. and I thought I got it right. Also it seems to be running hot which it did not do before. Another problem I have is that I do not have a tach that is sensitive enough to adjust the air screws. Any thoughts where I might be able to find one?

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virgilmobile
Posts: 7646
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: Carburetor problems

Postby virgilmobile » Mon Apr 04, 2016 7:27 am

I don't have one either.I listen to the engine.
As I turn the screw out,I can hear that cylinder starting to load up.then I'll back it down a full turn.
Most just preset them by the book and call it good.If your bike is lean across the board,the idle adjustment won't make a difference.




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