fuel mixture screw turned all the way in has no effect/ gl1500

you could have a pluged jet.. take it out squirt carb cleaner in it put it back and check for proper running.

Have you synct. The carbs?

yes i synced the carbs with a vacuummate sync tool. i was hoping i wasn't going to have to take the carb off again but i guess i have no choice. this happened to me once before and it took the third time to actually get it perfect. it was almost exactly the same scenario even down to the same color 1500 (candy red). i really appreciate the input.

Try turning the idle down some more. You might have the throttle plate too far open and it is not using the idle cicuit.

cycleman0622 said:

ok so i just finished overhauling the carbs on a 96 gl 1500 that sat for about a year. also replaced fuel pump, fuel filter and rebuilt petcock. i got it all back together but i could tell it's just not quite right off idle. so i noticed while doing the idle drop procedure that turning the mixture screw on the right carb,all the way in or out has no screw effect at all. when i turn the mixture screw on the left carb it does what it's supposed to do. i know i need to backtrack/ any suggestions on what to look for would be helpful....thanks.

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With the screw all the way in shutting off fuel to that side the engine should be running terrible. It is getting fuel leaking from somewhere else or tip of screw is broken off/missing etc. etc. Ensure that starter rods are fully closed when they are supposed to be with choke off.

And I echo what Redwing wrote about idle speed, the throttle plate could be open enough to be out of idle circuit. Which is why a bench sync is so important when dealing with unknown carbs/running conditions. A proper rebuild with bench sync and pilot screws at factory settings should run half way decent out of the gate. Anything less and you still got problems.

ok so i got your suggestions and i'm going back apart today. just like you said with the mixture screw all the way in the left carb does make the bike run like crap but the right side fuel mixture screw has no effect either way(all the way in or out). this also translates to the bike having a just off idle hesitation.

i had the idle set @ 800 rpm like the book says. the vacuummate digital sync gage had the carbs synced spot on. some how fuel was able to bypass the mixture screw being all the way turned in because it did not even flinch when i turned it all the way in

cycleman0622 said:

i had the idle set @ 800 rpm like the book says. the vacuummate digital sync gage had the carbs synced spot on. some how fuel was able to bypass the mixture screw being all the way turned in because it did not even flinch when i turned it all the way in

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What you say is true. The fuel mixture is probably coming from the venturi as the throttle plate is too far open. I would suggest you try to idle it down to 700 or so then try again. All you have to lose is a little time.