[Nathan]

My '82 GL500 has this weird problem, it wont go over 55 mph in 5th gear without using the choke. It will go well over 55 in 4th gear without the choke though, and runs fine in 5th gear with the choke out. Its just really annoying to have to work the choke while riding in heavy traffic with alot of red lights and stuff.



So far all I have tried is adjusting the fuel/air mixture screws and that didn't effect it.

 

[Nathan]

Its got 22k miles and been garaged kept for most of its life. My Grandpa bought it in like '92 and drove it to work every day for about 5 years. After that it sat in the garage until 08 when he finally gave it to me and I got it to its current state with just a repair manual. I've taken the carbs apart and soaked them 5 or 6 times probably in the last couple years. This is the last problem to fix before I would call it finished.



According to this picture that I found on another post here, my best guess is that there is something inside the passageways for the fuel/air mixture screws. I think they are the problem because adjusting them all the way in to taking them completely out doesn't really change much. I just don't know how to clean in there with those sharp bends and stuff, any ideas?

But I'm thinking its not a carb problem since it will go faster in 4th gear and will rev to red line in neutral.

 

[Nathan]

About 3k.

 

[Nathan]

I also ran a good deal of Seafoam through it during those 3k miles.

 

[Nathan]

This one?

 

[Nathan]

After much cleaning, everything looks fine to me. But I did discover that the lines coming from the petcock were wrong. The breather tube was connected to the vacuum port on the carb, and the vacuum line from the petcock was just hanging back by the airbox. Haven't had time to test drive it yet, but do you think this could cause my problems?

 

[Nathan]

Sound very much like a restricted supply

If properly connecting the tap doesnt sort it

( you may want to check the tank strainer too if fitted )

there's a work around to mod the often troublesome vac tap to a simple on off affair

havent had to do it myself as I have always used the basic taps but I expect the info's here somewhere

Yeah I had found the post that explains how to make it act like a regular carb instead of a vacuum carb, which is what made me go look at it.