Technical information and Q&A applicable to all years and models of Goldwings
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Posts: 27
Joined: Mon Apr 26, 2010 6:29 pm
Location: Clemons, Iowa
Motorcycle: 1983 gl1100 goldwing


Post by lovig214 » Sat Jul 14, 2012 8:49 pm

I am working on a 1980 cb 750. we put a carb kit in it. i know this is not a gold wing but do you know what the pilot screw does and how to adjust it. Also do you know where I can learn more about older carburetors? I would like to become proficient with them.

Thank you craig

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Re: carburetor

Post by virgilmobile » Sat Jul 14, 2012 11:31 pm

Pilot screws adjust the amount of fuel the engine will get at a idle ONLY.
As soon as you crack the throttle open,the fuel is ported through the slow speed jet into the holes right at the throttle plate.
Normally,you would find the adjustment details in a service manual.It's usually something like this.....
"Turn the idle mixture screw(pilot screw) in until it lightly stops.Do not turn in too tightly as this can damage the needle.Turn the screw out 2 and 1/2 turns."
This will be the preset point.after the carbs are synced,then the pilot screws are re-adjusted if necessary.Usually the factory settings are pretty close.
There is a procedure to adjust them and takes a close watch on a tachometer to see a 50 rpm drop.
A carb has the same function weather it's one or 6 of them.Basic cleaning,sealing,and alignment it the trick.
If you work on them,a sync will make the difference between OK and OH MY GOD.
You can buy a sync tool(pricey)or build a cheap one(search $25 vacuum sync).

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