having trouble locating the fuel air screw on carb

I have a 1981 650 maxim and its running lean and i am having trouble finding the fuel air mix screw. Can you cant it when their are all on the bike

 

Pretty sure they are on top of carbs on engine side right next to the choke plunger! There's a rubber cover that needs to come off!
This is assuming it's the same as mine!
Hope this helps!

 

No there is NOT a rubber cap over it.

The mixture screw is right next to the enricher plunger. If it has never been adjusted, or removed, you will not see it until you remove the BRASS PLUG that is over it. For appearance, all you will see is a little flat dull brass disc that is only about 3/16" diameter. (You need to drill a small hole into the cap. Be careful.... The screw is right under that cap)... Go slowly, and as soon as you feel the drill give way, STOP drilling. Now try to get the drill bit to " get stuck" in the cap ..... Now wiggle and pull til the cap backs out of the bore. You can also thread a metal screw into the hole and pull the plug out with pliers too... Once you get one out, go to the next.

Obviously you need to have the rack off the bike for this-----unless you're using jobbers bits or other really long tools....

Dave

 

+1 on using the sheet metal screw after you CAREFULLY drill a small hole in the brass plug.

 

Now might be a good time to point out that if you don't know where the mixture screws even are, it's not time to be adjusting them yet?

The adjusting comes AFTER the REMOVING of the screws and the CLEANING of the passages and the REPLACEMENT of the tiny o-rings on the screws.

Also AFTER the WET SETTING of the floats and a good BENCH SYNC.

If the mixture screws are still capped, there is quite a bit of work that needs to be done ahead of any adjusting.

 

I shouldn't be such an agreeable guy 8O . . . but . . . +1 to what Fitz said.

He is right, just tweaking your mixture isn't gonna fix anything, might put a band aid on it, but trouble will still be your only friend if you don't do the "whole nine yards".

 

The smaller of the 2 holes by that post is pilot mixture screw hole...the other is the enrichment circuit hole

 

Ok could you explain the wet setting of the floats please. I will bemch sync the carbs.

 

You get a bit of clear 1/4 inch tube from a big hardware store.
You need functioning drain screws, improvise a carb holder, and a small tank that holds 6 OZ of real gas.

Expect to spill alot of gas while you observe the level in the clear tube rise up to the washer on a bowl screw.

Then you bend a tab on the float the smallest amount you could imagine to set them right, if needed.

You need to see a thread on this. Search "wet setting floats"
Here's one - -

http://www.xjbikes.com/Forums/viewtopic ... art=0.html

 

Float Level how-to: http://www.xj4ever.com/setting%20fuel%20levels.pdf

You also need to locate and remove the pilot mixture screws, replace their tiny o-rings, and ensure their passages are clean.

If you didn't remove the emulsion tubes and clean them inside and out, you need to do that as well.

You can't adjust your way around actually servicing the carbs.