Please Help: Carbs cleaned now idles at 5k R's!!!

Ok, I got finished cleaning the carbs and installing 112 main jets as well as new float valves and seats. I will be running a K&N with drilled airbox and aftermarket mufflers. For now, the config is just an open airbox (no filter, its in the mail still). I bench synched the carbs and set the pilot screws to 2.5 turns out as per stock recommendation (they were all set differently before the clean up and the bike ran poorly then as well). After firing it up and seeing 5000 on the tach I turned them in 1/4 turn with no result.

Has anyone had issues with the carbs flooding when priming them again? It seems like I'm getting too much fuel as the plugs come out on the fouled side. The only thing is, I cant imagine the bike being able to rev to 5k R's without more air. I am going to check the bowl levels and stuff a t-shirt in the airbox and try again but I wanted to know if anyone has any tips for me? Thanks!

Mark

 

main and pilot jets reversed?

 

mine kinda did that and my problem was float levels were set wrong. Not saying that is your problem but you should at least check. Petcock is not set on prime is it?

 

The jets are definately in correct locations. The more I'm looking into this the more I'm thinking the floats need to be set. Petcock was set on prime to fill bowls then placed back into run position.

It is indeed possible that incorrect bowl levels will allow the bike to rev this high?

 

That's what was wrong with mine but I wasn't getting enough fuel in mine. That is why I said my problem was kinda like that. did you try to idle it down at all?

 

Ya, I backed the idle screw out as far as it seems possible with no result.

 

Mine to. Check your floats. The choke doesn't work either does it?

 

The choke sure works alright! LOL If I introduce any enrichment to the carbs via the choke, the R's jump to redline! I am definitely starting to think my float heights are off. The thought of having to struggle with those intake boots all over again makes me want to set my house on fire...

 

Tor---don't do it! That may have been what was going thru Phil's mind!.........

http://www.xjbikes.com/Forums/viewtopic/t=8625.html

 

Damn! Glad my petcock still works. Any thoughts on my prob chacal?

 

Carb Linkage jammed-up under the Head.
Common error when installing cleaned carbs,

Pull the rack back and free-up the Linkage.
DON'T Pry it or you'll bend or break something.

When the linkage gets stauck up under the head ... the Butterflys cant close at all.
See if that aint what you got going-on there.
I bet it is!

 

Just checked that Rick, was reading it on another thread. Looks to be all clear.

Just measured fuel level in the bowls and its definitely high. About 6mm above what it should be actually! I will be fixing that tomorrow then. I still dont understand how it can be revving to 5k though. It would still need more air than what idle should allow.

 

Watch, when I reinstall the rack tomorrow I'm gonna jam that damn linkage up! LOL

 

The worst part was the bike was idling properly for about 20 seconds. My guess there is that the bowls weren't (over)filled yet...

Can someone please explain how this would allow for 5k idle? Even if it is the answer and my bike idles fine, It would kill me not to know how that much air passes through with the butterflys closed.

 

Woot, I'm an idiot!!!!

The #4 carb throttle connection was hitting the back of the bolt on the boot clamp therefore preventing the butterflys from returning to closed!! I noticed this tonight at 2AM so I will fire that baby up first thing in the morning and verify that problem.

 

Check the choke and then check the idle screw. mine did the same thing full choked and idle screw was screwed all the way out ( previous owner) opened choke and made sure the idle speed screw was set at 1200rpms

 

I knew the throttles were being held open some kind of way. You can't get the engine to rev that high without Main Jets kicking-in.

Glad you found it!
Now eyeball the whole linkage and make sure that there's nothing else that's going to stick open while you are tuning.

 

Verified it today, it will idle anywhere I want it to! Off to the finer tuning, should be fun without a colortune.