RPM goes to 3000 when I press the clutch

Recently I've been riding my bike and once it gets warmed up I've noticed that the RPMs goes up to 3000 when I am pull back on the clutch. Does anyone have any ideas why that might be happening? I have no idea and I need suggestions on where to start looking.

Thanks!

 

re adjust the idle screw between carbs.
does this happen if you just let bike warm up and do not ride or just when riding.
start looking for vacuum leaks at carb to manifold boots, vac caps, throttle seals, airbox boots.
use unlit propane torch at all locations if no results carb cleaner spray go slow and look for rpm spikes

 

happens after the bike warms up. Thanks for the suggestions, I'll start tomorrow.

 

.have the same situation. where i cannot fully pull in clutch at a stand still as engine revs like crazy.then when i let of and go it almost bottoms out the other way to will die if not aware so i must always either push in _choke_ at almost stopping point"at a light or stop sign...
read something about the clutch cable being too tight ? is that right?
?

 

Sounds like a vacuum leak. Mine was doing the same thing after warm up. Everything is tight when cold, but as it rises to running temperature you get expansion... potentially opening up all those tiny spaces where air can sneak in. I tried the propane tank thing and did not have any change in idle. Maybe I was doing it wrong, or for not enough time, but I really did not think I had a vacuum leak.

Honestly the whole, putting an open propane tank near a running engine freaked me out a bit! I was imagining a cool hollywood-esque explosion putting an end to more than my idle problems... heh...

Last week I rebuilt my carbs (thanks LEN at xj4ever for EXACT FIT parts... click the logo top right of each page if you don't know who I'm talking about) and not only found a crack in the #2 intake manifold, but most of my throttle shaft seals were VERY crispy and therefore not doing their job of keeping things airtight.

 

as long as you have 2 to 3 mm play in the clutch lever your cable is ok.
push in choke what do you mean by that ?
sounds like you have a sticky clutch plates run some seafoam in the oil it will help clean out sludge, directions on can.
have you adjusted the throttle cable there should be a little slack at the carbs is throttle cable routed properly?

 

sprayed the boots with carb cleaner and didn't notice any spikes in RPM. I feel like the issue might be from this extra hose I have. I'll post pics soon.

 

is the hose connected to the carb manifold boot (where the carbs connect to motor)? if it is plug with a golf tee until you can get a cap for it. the hose connects to the petcock small nipple.


what bike do you have

 

Run away rpm issues have to do with carb sync, float levels and vacuum leaks.
I would start with a general maintence. Check valve clearances, pull carbs and inspect throughly, make all the adjustments and wet set the floats, clunk test the slides. Check the carb manifolds for any cracks no matter how small and address that. Do a running sync and see how runs after that. Pretty sure you will find the issue in that process.

 

I have an XJ700. In the place where that hose is, there's a cap on every other carb so that hose looks really out of place to me.
Is that what you were talking about, XJ550H?

 

Just went out to the garage and I know which hose you're talking about now. It might actually be the issue. The end that connects to the petcock doesn't have the metal clamp that keeps it in place. Could be when the bike gets going it gets pushed back and its causing a vacuum leak. Gonna test it out

 

I think the hose hanging from the side is an over flow hose. 700 has funny hoses.
but the hose from the petcock to the manifold boots should have a clamp and be vacuum hose not fuel line. if you have the original molded shape hose you may want to replace it. with a regular vacuum hose cheap fix if if it corrects the problem. it controls the fuel flow into the carbs when motor is running.
it uses a wire clamp not a screw clamp which would be hard to put on

 

I have two hoses disconnected due to running solo air cleaners could that be why mine is doing the same thing? If so how should I plug or fix those two hoses

 

the big hose is a crankcase breather hose should have a pod style filter on it. the other hose might be the drain for air box where does it go to?
It would be best to start your own thread on this issue

 

I rode around today and the issue popped up again. I realized that when I set the idle the first time around the bike wasn't fully warmed so I just reset the idle while this issue was happening and hopefully the fix is that simple.

 

very well could be that simple . update us in the next few days

 

Taken the bike out for a couple rides since I re-adjusted the idle knob after warming the bike properly and that seems to have done the trick. Thanks again everyone for the suggestions and advice!