Bike starts and runs at 6000 RPMS

The bike starts instantly and runs up 6000 rpms. The idle adjustment has no affect on this.

Stripped the carb bodies down to the bare essentials. I mean we removed everything.
Cleaned the bodies by soaking them in a bucket of carb cleaner and a scrubbed all parts clean using parts cleaner.
Bottom line the carbs look like new. Inside on out.

Did the bench sync per the tutorial posted here. Copied the number of turns the jets go into the carb housing to the letter

It starts great but it would be nice if it would idle. I don't think it would be good to operate a bike at only 6K rpms

I am stumped. Any suggestions?

 

turns INTO the housing? You measure the number of turns OUT from lightly seated all the way IN.

Or is that what you meant?

 

The Linkage MUST be stuck open.

Check the Cable Hook-up is not jammed-up.

Make sure the Manifold Clamps aren't fouling the linkage.

 

Linkage is fine, it moves freely. First thing we checked

 

Maybe try unhooking the throttle cable then start it to see if the problem goes away. I had the same thing, I had caught the throttle cable under the tank pulling it too tight. It was causing the bike to start with the throttle open.

 

It's worth a try.

 

Just thinking out loud here, did you ever take out or check the air jets, they are sort of reverse from fuel jets (big number for pilot air, small number for main air)

OR maybe you've dropped a pilot jet or two somehow and your drawing WAY too much gas.

Hopefully Rick will post that awesome pic he has of the air jet placement.

 

Checked the linkage. All is fine.

Still starts at full throttle

 

Perhaps the choke is stuck on?
Otherwise I also vote a jetting issue.

 

Try backing the idle adjuster all the way off, then start the bike and see if it's made a difference. Even without a throttle cable fitted the idle adjustment screw could be holding the throttles open. Nige

 

If it's not a trapped throttle "quadrant" or a tight throttle cable, then it's one thing . . .you have one butterfly severely out-of-kilter and it's holding the others open. You botched the bench sync somehow.

 

How completely "removed everything?" Butterflies and throttle shafts, and installed new throttle shaft seals?

If you "broke the rack" you might not have the carbs back completely lined up correctly and the linkage could be binding.

What method did you use to set the float levels?

 

Everything as in the carb body was devoid of hardware.
Yes we broke the rack. As far as I can tell the linkage is working fine.
Float level. Honestly that never crossed my mind. I guess that is next on the list.

 

I would bet your floats are in upside down.