Where is the idle screw?

This maybe posted somewhere but I yet to find it. I have an 1982 Yamaha XJ Maxim 750. Where is the screw to adjust the idle? If I choke it to start the bike it starts fine. I am just trying to get the bike to idle after I shut the choke down.
The only screw I can see is the one the holds the choke cable onto the carbs. Any help would be greatly appreciated. A picture would be really nice. :lol:

 

Not sure if it's the exact same, but it's usually here:

 

that picture shows your idle speed knob. This opens and closes your butterflys. You idle mix screws are on the top of the carbs on the engine side. One for each carb and may be covered by plugs.

 

Look between the back of the two middle carbs.

Sometimes they are tight and Hard to move.

When the Bike is cold.
Take a wire coat hanger and make a long "Pointer"
Put the far end of the Hanger ON the Threads of the Idle Rod.

Place drops of Oil on the upper Hanger and let them run down to the threads.
Once the Threads are lubed ...
"Exercise" the Rod in and out and get it moving again.

 

Just a side note:

If your carbs aren't properly bench synched one of two things can happen.

1)You will never get the bike to start, or at least it will start and then immediately stall or

2)No matter how far down/out you try to adjust your idle adjustment screw, the bike will continue to idle higher than it should

Experience has told me both #1 and #2 are true.

 

I saw that pic and was hoping it wasn't for mine. I take it you have to left up the tank to get access to it. Looks like it is on the backside of the carbs toward the tailend. Guess I may as well replace that fuel filter while I am in there. Thanks for your help. :lol:

 

I don't know what your carbs look like, but I have an 83 XJ650 and I don't need to lift the tank to get to my screw. I do however need to watch it when the engine is hot, because well, tight spaces and heat don't mix well. I also have the advantage of being a smaller guy so my hand can squeeze in there!

 

To answer your question AND try not to confuse things too much:

The main knob is similar to that pictured, and is in the center of the rack o'carbs, underneath, and resembles a miniature faucet handle. This adjusts the overall throttle stop setting. Clockwise should increase idle speed.

There is an individual throttle adjustment screw on carbs #1, 2 and 4. These adjust the position of the butterflies relative to each other, and are what is being referred to when people talk about a bench sync or a running vacuum sync.

There are individual idle fuel mixture adjustment screws located on the top of each carb, which were covered by blind plugs from the factory. These are used to adjust the idle mixture for each carb.

Don't fiddle with anything other than the main knob unless you're ready for carburetors 101.

 

Thanks Guys., I just went out and look again, found the animal. Now that I have this thread going I will follow it. I will get the screw lubed and don the gloves and do a slight adjust.

 

Excellent, what a great picture, I was also looking for this screw.

Thanks!

 

Anyone with big hands can reach in from both sides and spin the knob with the tips of your fingers. It would turn a bit easier if the throtle was opened also ( VistaCruise ).

 

This helps me a lot. My bike has had a very low idle since I got it. I have to leave the choke on for about 15 minutes before I can shut it all the way off.