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Old 05-06-2013, 04:01 AM   #1
wantok OP
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Joined: Dec 2008
Location: Darwin, NT Top End Australia
Oddometer: 150
Advice please - weird jetting symptom

Need some advice people - I recently cleaned all of the jets in the carbs on my 04 950 ADV & replaced the needles & installed larger main jets. It is smoother now & runs fine except that whenever you pull up to the lights, it idles up at 2000 rpm. I turn the idle down to about 1200 with the idle adjust knob & it's fine, but next stop, back to 2000 again, adjust it down, next stop 2000 again. Any ideas? Its driving me nuts! It wants to keep rolling along at 2000, without any throttle...

Many Thanks

Nick (wantok)
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Old 05-06-2013, 04:08 AM   #2
Orangecicle
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Location: West Des Moines, IA
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What jets did you use. Tell us about the bike--cans, SAS, canister, prefilter, elevation, etc. You say "replaced the needles." With what? What mains did you put in? What idle jets are you running? What is your float height? Have you changed any air jets?

High idle on these bikes can be either rich or lean. You can usually see the lean because of exhaust smoke, but being slightly lean can really fool you. When you get the mix rich, the bike tends to idle high.

I did this thread trying to get the best advice on where to turn with my jetting: http://advrider.com/forums/showthread.php?t=625328

Here is where I landed for my bike: http://advrider.com/forums/showpost....1&postcount=19

Installing these helps: http://advrider.com/forums/showthread.php?t=635678
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Orangecicle screwed with this post 05-06-2013 at 04:42 AM
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Old 05-06-2013, 05:18 AM   #3
Sporting Wood
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Sounds like a hanging rich idle.

Whenever you bump the mains or raise the needle you have to compensate the low end for the extra fuel.

If its so bad that its hanging, its doubtful a simple turning in of the screws will do much to help.

Did you check the float heights?
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Old 05-06-2013, 08:47 AM   #4
hooliken
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Joined: May 2007
Location: Smithfield, VA
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Check for intake leaks.

Cheers

Ken
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Old 05-07-2013, 12:07 AM   #5
wantok OP
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Joined: Dec 2008
Location: Darwin, NT Top End Australia
Oddometer: 150
Quote:
Originally Posted by Orangecicle View Post
What jets did you use. Tell us about the bike--cans, SAS, canister, prefilter, elevation, etc. You say "replaced the needles." With what? What mains did you put in? What idle jets are you running? What is your float height? Have you changed any air jets?

High idle on these bikes can be either rich or lean. You can usually see the lean because of exhaust smoke, but being slightly lean can really fool you. When you get the mix rich, the bike tends to idle high.

I did this thread trying to get the best advice on where to turn with my jetting: http://advrider.com/forums/showthread.php?t=625328

Here is where I landed for my bike: http://advrider.com/forums/showpost....1&postcount=19

Installing these helps: http://advrider.com/forums/showthread.php?t=635678
hi orangecicle - I installed factory pro needles for the 950 adv. went to 175 rear & 170 front. the floats are about 3.3 to 3.4mm. Kept the idle jets standard. Im in a hot humid place (Darwin Australia) with wings cans (no restrictors) & run a DNA air filter. The idle jets are standard size - Aust models didn't get the canister - no pre filter any ideas?

Cheers

Nick (wantok)
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Old 05-07-2013, 04:46 AM   #6
Orangecicle
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Location: West Des Moines, IA
Oddometer: 2,061
With your elevation very close to sea level I would think you are not that far off. Your mains may be making you rich across the board.

Check carb balance, make sure the choke is not sticking, make sure TPS is about right, and then start working with the IMs to try and find a setting that calms it down. Two turns out should be close. Note that if it will start in cold temps with no choke, that means it is rich. If you try everything else, lower the main size a step and try again.
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