rpms racing

check you cable and make double sure that it is seat all the way in the holder not hanging on the mount also how much freeplay do you have in the cable it should be about an 1/8 of an inch.

no cable is on...

find the air leak man.... make sure that none of the vaccum pick ups bung are missing

Where still fitted, epa paraphernalia is a likely air leak source.

Good Fortune!

So I cleaned them again and installed them today.

This time I made sure EVERYTHING was connected. (Last time, I did not have the back boots on)

So I had everything on, including all vacuum hoses, boots, etc.

Would not start immediately, but a slight spray of starting fluid got it going, and it started right up every time after that. Immediately it just races up to 4-5k rpm and sits there. Before I put them back on, a few days ago I disassembled everything and pressure washed everything with the jets still in. I made sure to get all fuel passageways and everything sprayed out to get pretty clean. When I first cleaned the carbs, I ran them through a dishwasher a couple of times. So I figured spraying them out would be a good idea since the washer might have left deposits unseen. (I have used carb cleaner and compressed air as well)

New kits are installed, new pilot screws, o rings, washers, gaskets, float valves, etc. Float levels set at 4 mm precisely. Pilot screws were turned all the way in and backed out 2 turns.

I tried various things today but nothing seemed to make a difference. I took off the vacuum hoses that connect to the outsides of the carbs and put vacuum plugs on just to see if the hoses leaked-no change except maybe a slight bogginess revving up.

Turned pilot screws all the way in and out-no change
Turned idle screw all the way to the left-no change
Turned idle screw to the right, messing with it a bit-no change
Sprayed the entire carb assembly down with water, all hoses, rubber boots, mixture screws, and was having the sprayed down by my lady while starting it-no change whatsoever.

I am at a complete loss on this. My XJ650 is doing the same thing when after I went through them. I do not think is a sync issue, the butterflys look way too close to be doing this. Even on my XJ I did a very thorough bench synch and it kept racing up.

Boots look really good as well, putting on the rear boots was really easy, they were soft and flexible.

The only other thing I did to the carbs was polish the slide bores. Wet sanded with 800 and polished them so the slides could move with no resistance. Could this be a problem?

If anyone has any ideas, I would GREATLY appreciate anything. I am completely out of ideas now... :'(

Another thing- it sounds like it is firing on 3 cylinders. Pulled the far left spark plug and it was wet with gas.

do you actually have 4 vacuum gauges to check sync or not? if you dont, then get/borrow carbs sticks, its pretty obvious one cyl is getting too much air (vacuum will be low). if you cant find the leak by yourself then you have no other way to find it other than with the 4 gauges.

one cyl running rich just confirms that.

Found out the the bar that holds the rack together under the throttle linkage was installed backwards by the PO. It is idling like a dream right now :_)

Just curious, how did you finally become aware of the POs mistake? And is the part you're talking about the mounting plate?

peace