Wandering idle... - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 20 Old 04-11-2016, 02:34 PM Thread Starter
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Wandering idle...

I have an '09 KLR with about 57K miles on it that I recently bought used. Once warm the idle will run between 1300 and 1500 rpm with a little fluctuation. However, sometimes the idle will ramp up to about 2000 when coming to a stop. Any ideas?
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post #2 of 20 Old 04-11-2016, 03:06 PM
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Vacuum.

'11 KLR 650: KLR Full Bag Kit, 22 Mod, Thermo-Bob w/ Overlay, Angular Mirrors, Studebaker Doo, Tusk Drain Plug, UNI Filter, K761's, ODI Emig Grips, LED Cluster & Tag, Digital Clock w/ Temp, Eibach 400# RR, Progressive FR w/ adj Pre-load caps, ZG Double Bubble

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post #3 of 20 Old 04-11-2016, 04:06 PM Thread Starter
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Quote:
Originally Posted by Fox Fader View Post
Vacuum.
I'm still a KLR n00b, where is the vacuum and how do you adjust or fix? I'm assuming that it's the hose on the side of the fuel valve to the carb. Can I put a standard gravity flow valve in and put a plug on the carb and get rid of it? I did something similar on my Ural years ago.

Last edited by JohnBG; 04-11-2016 at 04:16 PM.
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post #4 of 20 Old 04-11-2016, 06:39 PM
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Do yourself a huge gavor and learn to dismantle the carb, completely, clean it and reassemble it after making 100% sure it's air/fuel passage ways are completely clear. Then check the choke system and make sure the little tabs on that plastic fitting are intact and not broken. Take off the intake boot and check O ring for it's condition for a vacuum leak.......check the boot from the airbox to carb for leak, is the boots fitting before and after the carb correctly. Is the air vacuum hose that controls the petcock is in good shape etc and also the one for the polution crap which goes forward.......just a few suggestions to check first. I would then check the DOO's condition, spring and DOO, then check valve clearances, spark plug, coil wire from coil to sparkplug for good solid connection and if not snip it back 1/4" and reintall on fresh wire so to speak. etc.....all things I would check if i bought a secondhand bike. Yes far more than you wished to hear but that is what i would check.....also new aircleaner if old, and clean and reoil with correct filter oils.
Sorry to babble....lol




Willys
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post #5 of 20 Old 04-11-2016, 08:06 PM Thread Starter
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Willys - The previous owner claimed he did the Eagle Mike doohickey upgrade, the only way to tell for sure would be to pull the cover.

I was thinking maybe an intake leak, I will need to check. My Ural has two CVK 32 carbs similar to the one on the KLR and the carb flanges are a weak spot on the Urals. My Ural also had the same or similar vacuum operated petcock which was flaky and I ended up capping off the vacuum port on the carb and replacing it with a Yamaha gravity petcock.

Do I need to pull the gas tank to get to the carb?

Or maybe I am just bumping the choke lever...
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post #6 of 20 Old 04-11-2016, 08:19 PM
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Pulling the tank is relatively easy in the long run....lol
and you will see two vacuum hoses coming from the same spout so to speak at the top of the carb, one going to the petcock, which is an excellent unit, I have been using one since owning my bike without issue.....I even tried to modify it only to referse it back to stock, it works well. The second vacuum line goes up the frame to the clean air mechanism or whatever the correct term is for it...I pull all if the customer wishes, I haven't had a single one who wanted to keep it. You need to solder the fitting shut on the head or simply plug hose close to the metal pipe.....do it right and seal the fitting at the head.....simple and forever out of the way. Now if you lve in California, maybe you shouldn't if they check for such things...lol. The choke fitting is w known issue and there is a very nice alluminium if I recall correctly or steel???....after market fitting to replace the crap plastic stock version. IF the tabs break off, the choke doesn't sit flush where it should and thus pulls on the choke system. You must know that a perfectly clean carb is essencial, and I expect you know how to clean it, I strongly do so. Also check theDOO and see for yourself what exactly the previous owner used etc regarding the DOO. Peace of mind is worth it's weight in solid GOLD! The intake boots are not really well known for leaking but it does happen. What elevation are you at? maybe a jetting change may be in order? I live just north of Toronto Ontario, I run 145 main, pilot turned out to 2 1/4 turns out from gently seated. I highly recommend the KLX needle kit and set the needle at 3rd slot.....but it all depends upon your elevation. Also pull your snorkle from the airbox if it's still there.

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post #7 of 20 Old 04-11-2016, 08:21 PM
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Another thought is ......is the choke cable tight and when the bars turned either way it can pull slightly on the cable causing the mixture to be compromised. A simple rerouting is all that is needed.

Willys
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post #8 of 20 Old 04-11-2016, 08:55 PM Thread Starter
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Quote:
Originally Posted by willys View Post
Pulling the tank is relatively easy in the long run....lol
and you will see two vacuum hoses coming from the same spout so to speak at the top of the carb, one going to the petcock, which is an excellent unit, I have been using one since owning my bike without issue.....I even tried to modify it only to referse it back to stock, it works well. The second vacuum line goes up the frame to the clean air mechanism or whatever the correct term is for it...I pull all if the customer wishes, I haven't had a single one who wanted to keep it. You need to solder the fitting shut on the head or simply plug hose close to the metal pipe.....do it right and seal the fitting at the head.....simple and forever out of the way. Now if you lve in California, maybe you shouldn't if they check for such things...lol. The choke fitting is w known issue and there is a very nice alluminium if I recall correctly or steel???....after market fitting to replace the crap plastic stock version. IF the tabs break off, the choke doesn't sit flush where it should and thus pulls on the choke system. You must know that a perfectly clean carb is essencial, and I expect you know how to clean it, I strongly do so. Also check theDOO and see for yourself what exactly the previous owner used etc regarding the DOO. Peace of mind is worth it's weight in solid GOLD! The intake boots are not really well known for leaking but it does happen. What elevation are you at? maybe a jetting change may be in order? I live just north of Toronto Ontario, I run 145 main, pilot turned out to 2 1/4 turns out from gently seated. I highly recommend the KLX needle kit and set the needle at 3rd slot.....but it all depends upon your elevation. Also pull your snorkle from the airbox if it's still there.
I live in Florida literally double digits above sea level...
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post #9 of 20 Old 04-11-2016, 09:19 PM
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Quote:
Originally Posted by JohnBG View Post
I live in Florida literally double digits above sea level...
JohnBG,
Willys isn't much higher up the hill than you. He is near the Great Lakes, up (or is that 'down south') the St. Lawrence Seaway. (Just a few Locks.) So, nearly sea-level also.

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post #10 of 20 Old 04-11-2016, 10:16 PM
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I'm at 630 ft ASL next to Lake Michigan.
Stock pilot jet, idle mixture screw out 1 2/3 turns,
Sporster needle metering a 150 main.

Welcome to KLRforum.com. You are in the right place
for fixing stuff and learning from the best. I'm in the middle
of the teaching/ learning curve so take the Cheapster with a BIG
grain of salt. Nearly all of us like to gently lead newer members to the
search bar. Dozens of detailed threads, explanations, youtube links,
and pics of stuff are all there. It's worth every dime to buy a service manual.
It will pay for itself first time you use it in saved labor charges.
My bike is 6 years old with 19,000 miles and has never yet seen the inside of a shop
thanks to this oddball collection of humans who love elephants.

Next issue is to find your intermittent (cracked) vac hose, and/ or clean the low jet.
If that doesn't work, see Willys list.

CheapMark

This is my son, with whom I am well pleased." ----God
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