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Old 07-03-2012, 09:12 AM   #1
kanur OP
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Help needed from the carb gurus, 950 won't idle down

I have a new to me 04 Adventure with 15,xxx on the clock. My problem is it does not want to idle down properly. When coming to a stop or just pulling the clutch in it only wants to drop to 2,000 rpm.

If I come to mostly a stop with the brakes on and clutch out it will idle down to 1200. While stopped if the throttle is blipped it will idle fast again but if a load is put on it holding the brakes and letting the clutch out slightly it will idle back down.

I have checked to see that the cables are not in a bind and tideyed up all the wiring. The only thing I have in the plastic loop on the front of the top triple clamp are the throttle and choke cables. Turning the bars from stop to stop does not change a thing.

Other than this the bike runs and starts great. It has a Uni pre filter on it and I would guess has been rejetted. While this bike is new to me I am not new to the LC8 as I have had a 950 SE for a couple years that I put a H2W prefilter and jet kit in.

Any thoughts?
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Old 07-03-2012, 09:36 AM   #2
Holeshotking
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I hope you get some hits, because mine has done the exact same thing sice I got it in April!
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Old 07-03-2012, 09:38 AM   #3
Chuckracer
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It's either lean on the bottom end or you have a vacuum leak.
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Old 07-03-2012, 09:56 AM   #4
kanur OP
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Vacuum leak sounds possible but does not surge at a steady mid range. Looks like I'm going to have to dig deeper.

It doesn't seem lean, my SE was crazy lean when I got it. I got it with 2000k on it and all the PO had done was put Akras on it plus we are basicly at sea level here. It would sound like a gattling gun if you chopped the throttle off.

BTW the Adv has had all the SAS and canisterectomy done.

Forgot to ask, what would you change to fix a lean bottom?
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Old 07-03-2012, 10:13 AM   #5
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I'd start with turning the fuel screws out 1/4 of a turn.
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Old 07-03-2012, 10:25 AM   #6
MookieBlaylock
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i would find out what jets it has and clip position and turns out it has first, then adjust from there. I switched to a 45 pilot with fewer turns out in 3rd clip and that seemed to help from 0 to 4k. The 80 iaj from the h2w kit i liked most with somewhere in the 150 to 160 range for sea level .The Flex jets fuel screws help alot for adjustment. It had an in line fuel filter but that caused that idle hang thing
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Old 07-03-2012, 10:51 AM   #7
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That's better advice!
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Old 07-03-2012, 11:13 AM   #8
kanur OP
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Thanks Guys, looks like I'll be calling Ken.

What lets it idle right by putting a momentary load on it?
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Old 07-03-2012, 11:50 AM   #9
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Silly vacuum issue perhaps, but anyway...

Quote:
Originally Posted by kanur View Post
Thanks Guys, looks like I'll be calling Ken. What lets it idle right by putting a momentary load on it?
Your motor behaves like mine (while still subject to warranty and unacceptably poor services by KTM-workshops) some years ago. One of the two little hoses for carb syncronizing was not plugged.
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Old 07-03-2012, 11:59 AM   #10
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Vacuum leak, spit or leak in diaphragm.
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Old 07-03-2012, 12:16 PM   #11
Orangecicle
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It's rich or lean. Mine does just what yours does when rich. Install FlexJet 2s so that you can have flexibility to change the mix on the fly. I'm visiting my Dad right now in Denver and had to go from my standard 2 turns out on the IMS to 1.75 turns out to make the bike idle right. I did that while stopped at a light. :). Also check that your filter isn't dirty and that there are no obvious gremlins about, like air leaks. My experience in that regard is that the bike backfires into the carb if there is an air leak because of the lean condition. Also, check your carb sync. That can throw things off. But, I would bet you're rich just a tad. Very hard carbs to get perfect.
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Old 07-03-2012, 12:18 PM   #12
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Also, search for my old posts. I did a full history on everything I tried to get my bike running right. Mine's perfect now.
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Old 07-03-2012, 12:39 PM   #13
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Here's the Picture of the Carb Sync Vacuum Nipples from here:
http://www.ktm950.info/how/Orange%20...carb_sync.html



Note the Screws on the Carbs at the Opposite Side of the Red Arrows. Some use Rubber Caps (in lieu of screws) and they can Blow Off causing your conditions.
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Old 07-03-2012, 12:49 PM   #14
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You may be able to View these Nipples/Screws Conditon by just taking off the Left Side Airbox Triangle Cover.
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Old 07-03-2012, 02:26 PM   #15
kanur OP
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More good info

On my SE I went to great lengths to make sure everything was plugged well so not to have vacuum leaks. Since I'm not the one who did this one I guess I need to dig into it and see what I have.

It could be rich, it doesn't like much choke and my SE likes it full on to start.
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