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carb trouble
- need info on air screw adjustments
started by NateP
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February 8th 2010 at 11:40 AM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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ok i have a 96 polaris ultra sp and two of the carbs air screws ar at 1 turn out but the other cylinder will not fire while idling at one turn out so i let the screw in to about a 1/2 to 3/4 of a turn and it started to fire on that cylinder at idle will this harm the sled in any way with one of the three carbs being set differently?
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February 8th 2010 at 11:53 AM
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ultrawillie
sledhead
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924 Posts 
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Have you taken all 3 carbs apart?? I would be looking at pilot jets, when you turn the air screw in your richening the mix, and if the sled is stock with #50 pilots I find it hard to believe that you would have to richen it more.
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February 8th 2010 at 12:03 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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i just bought it first i thought it was the jet needle and i bought a new one and put it in the i started to mess with the air screw and the more i tuned it in the more it would fire on that cylinder the guy i bought it from had slp pipes on it and 380 mains but i never took the pilot jets out
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February 8th 2010 at 12:08 PM
[ Modified February 8th 2010 at 12:08 PM
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picman
Average Member
picman is enjoying allergy season!!
Updated Monday at 1:09 PM
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861 Posts
Group: Members
Member Since: January 15th 2009
Location: Marinette, WI, USA
Current Sled: 1998 Polaris Ultra
2008-2009 Miles: 1145
2009-2010 Miles: 449
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I had a little different take on his statement. Why would that cylinder start to fire on a richer mixture?
NateP are you talking actually firing or just a smoother idle?
Edit: I guess Nate answered while I was typing
Truth doesn't need your permission to exist.
Fortune favors the prepared mind! Louis Pasteur
Working is the scourge of the drinking class! Oscar Wilde
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February 8th 2010 at 12:09 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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well the pipe on that cylinder was cold i turned the screw in and it began to get hotter so actually firing
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February 8th 2010 at 12:23 PM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
i just bought it first i thought it was the jet needle and i bought a new one and put it in the i started to mess with the air screw and the more i tuned it in the more it would fire on that cylinder the guy i bought it from had slp pipes on it and 380 mains but i never took the pilot jets out Try doing one step at a time, First step would be take carbs apart and clean them, paying particular attention to your pilots, reset air to 1 turn out fron seat then try running it. Let us know how that's working.
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February 8th 2010 at 1:22 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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already tried that and it still wouldnt fire first i cleaned them then i changed the jet needle (old one was coroded) then i started to mess with the air screw i did these all one at a time then i just tried to take the pilot jet out to see if it was the right one and of coarse it fell apart while i tried to take it out so now i dont know what else to do
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February 8th 2010 at 7:05 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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well the jet would not come out i even broke an easy out trying to do it so it sounds like that was my problem now im lookin for a new carb
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February 10th 2010 at 1:31 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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i got a new carb and put the right jets in it and now it is running great
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February 10th 2010 at 1:33 PM
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picman
Average Member
picman is enjoying allergy season!!
Updated Monday at 1:09 PM
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861 Posts
Group: Members
Member Since: January 15th 2009
Location: Marinette, WI, USA
Current Sled: 1998 Polaris Ultra
2008-2009 Miles: 1145
2009-2010 Miles: 449
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Good to hear. Thanks for updating everyone
Truth doesn't need your permission to exist.
Fortune favors the prepared mind! Louis Pasteur
Working is the scourge of the drinking class! Oscar Wilde
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February 11th 2010 at 1:12 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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ok i kinda lied after riding a little i found out its running a little lean any suggestions on what jets to run right now its got a 247Q2 needle jet and the stock jet needle(i think they are 6Dh8) with 380 mains
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February 11th 2010 at 1:24 PM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
ok i kinda lied after riding a little i found out its running a little lean any suggestions on what jets to run right now its got a 247Q2 needle jet and the stock jet needle(i think they are 6Dh8) with 380 mains
You need the right jet needle to match the needle jet. the JN # is 6-CEY-06 and refresh my memory stock exhaust or pipes and if you have pipes what brand??
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February 11th 2010 at 1:32 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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February 11th 2010 at 1:47 PM
[ Modified February 11th 2010 at 2:04 PM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by ultrawillie
Quote originally posted by NateP
ok i kinda lied after riding a little i found out its running a little lean any suggestions on what jets to run right now its got a 247Q2 needle jet and the stock jet needle(i think they are 6Dh8) with 380 mains
You need the right jet needle to match the needle jet. the JN # is 6-CEY-06 and refresh my memory stock exhaust or pipes and if you have pipes what brand??
I have a feeling your running lean in your mid range from not haveing the right set up like I stated above. Those SLP pipes are designed pretty close to what the 97 SPXs are, and the SPX runs stock 380 mains. Me personally I would get my JN & NJ matched, E-clip at 3rd slot from the top and run it through mid range and by checking your plugs then you'll know.
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February 11th 2010 at 7:11 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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thanks ultrawillie im gonna look into findin me some new jet needles i guess
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February 12th 2010 at 12:01 AM
[ Modified February 12th 2010 at 12:02 AM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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would this be any different from the jet needle 6cey6 i dont know if the 0 makes a difference but the carb i just bought had a 6cey6 needle but i didnt use it and if this is what i need than i will get ahold of the guy i got the carb from and see how much he wants for the needles in the other two carbs he had
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February 12th 2010 at 1:45 AM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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one more question i have is all over this website ive seen people saying they run different size main jets in different cylinders but whenever i ask people i know about it they look at me like im crazy and i just made it up what could this benifit? (kinda off topic but i was just curious) but everyone i know say that they have never heard of running diferent sized mains they all run the same size in all 3 cylinders
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February 12th 2010 at 10:47 AM
[ Modified February 12th 2010 at 10:52 AM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
would this be any different from the jet needle 6cey6 i dont know if the 0 makes a difference but the carb i just bought had a 6cey6 needle but i didnt use it and if this is what i need than i will get ahold of the guy i got the carb from and see how much he wants for the needles in the other two carbs he had
The 0 makes no difference 6-cey-6 is what you need and you also need the Q2-247 NJ to match. Quote originally posted by NateP
one more question i have is all over this website ive seen people saying they run different size main jets in different cylinders but whenever i ask people i know about it they look at me like im crazy and i just made it up what could this benifit? (kinda off topic but i was just curious) but everyone i know say that they have never heard of running diferent sized mains they all run the same size in all 3 cylinders
I've done step jetting, for example a center cylinder on an XLT will want a fatter jet because of the heat. You would have better success at step jetting if you were running EGTs.
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February 12th 2010 at 11:25 AM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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oh ok i was just curious about the whole different jets i did not understand cause im kinda new to the whole thing but i just bought the needles i needed 6-cey-6 for 10 bucks so im gonna put them in today and see what happens but it sounds like the guy i bought the sled from kinda half a$$ed set this up for the pipes he put on it. but should i be good with the stock #50 pilot jets?
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February 12th 2010 at 11:37 AM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
oh ok i was just curious about the whole different jets i did not understand cause im kinda new to the whole thing but i just bought the needles i needed 6-cey-6 for 10 bucks so im gonna put them in today and see what happens but it sounds like the guy i bought the sled from kinda half a$$ed set this up for the pipes he put on it. but should i be good with the stock #50 pilot jets?
The stock 50 PJ is fine, it will be a little rich, and load up a bit when you go to give it gas.
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February 12th 2010 at 12:02 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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but with the new needle it should be better in the mid range ?? because it seemed to me that it was a little boggy in the mid to high range
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February 12th 2010 at 2:47 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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ok i put the new needles in and now when its at idle and i gun it it tries to die but if i slowly work the rpms up then gun it it takes off faster than ever so im thinkin ive got the right needles but i gotta move the e clip up one maybe what do you think?
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February 12th 2010 at 5:38 PM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
ok i put the but new needles in and now when its at idle and i gun it it tries to die if i slowly work the rpms up then gun it it takes off faster than ever so im thinkin ive got the right needles but i gotta move the e clip up one maybe what do you think?
Now that you seem happy with mid range, your idle and initial take off is going to be your pilot jets and air screw adjustment, if you still have the stock #50s and your air is at one turn out from seat, you could try turning your air out 1/4 turns at a time or buy different pilots.
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February 12th 2010 at 5:58 PM
[ Modified February 12th 2010 at 6:00 PM
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NateP
Starting Member
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32 Posts
Group: Members
Member Since: January 26th 2010
Location: clio, Michigan, USA
Current Sled: 96 Polaris Ultra sp 680
2009-2010 Miles: 60
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if i were to buy diff pilots what size would i get bigger or smaller and if i adjust the air screw will this make it not want to die when i take off and could i just adjust them and test it with the air box off (easier access to the air screws) or will no air box effect it also
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February 12th 2010 at 6:48 PM
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ultrawillie
sledhead
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924 Posts
Group: Members
Member Since: February 24th 2009
Location: virginia, mn
Current Sled: 96 polaris ultra
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Quote originally posted by NateP
if i were to buy diff pilots what size would i get bigger or smaller and if i adjust the air screw will this make it not want to die when i take off and could i just adjust them and test it with the air box off (easier access to the air screws) or will no air box effect it also
sending a P.M
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