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Old 11-27-2009, 05:30 PM   #1 (permalink)
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93 XLT Carb settings?

Hey guys, Me again... Well i got soo sick and tired of dealing with bogging on my sled that i cleaned my carbs (they were clean in the first place) and now im dealing with the problem of my air/fuel mixture being too rich, reason why i call it too rich is when i start my sled it smokes like a bushfire and when i give it trottle i can hear the bog in my airbox cause the bogs loud as hell.. The screws are set at 1 1/4 turn and im just wondering if anyones got the best setup for this sled cause ive heard 1 1/4 of a turn to 2 turns and 1 2/4 of a turn..... Really.... Whats the best setup for the mixture to make the sled as snappy as it can be? Were gonna be getting snow soon and i need my sled to be running atop cause im out far into the bush and the last thing i need to be is stuck with a sled that dont wanna go anywhere... HAPPENED BEFORE!!! Please help guys....
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93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 05:36 PM   #2 (permalink)
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1 turn only.
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Old 11-27-2009, 05:46 PM   #3 (permalink)
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Are you sure Rj cause i got it set at 1 1/4 turn right now and its running like sh*t? This sled should be able to run and take off like a raped ape but instead right now its like a crack the throttle and it just dont have no power what so ever....
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 05:51 PM   #4 (permalink)
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With Poos, I have always had best results with the air screw at 3/4 to 1 turn out for best throttle response.
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1980 AC Pantera (donor engine to the 90 wildcat)


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Old 11-27-2009, 06:01 PM   #5 (permalink)
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Really? This damn sleds gonna get the shotgun soon! Its really starting to yank my chain... Ill try running it a little leaner and if that dont work then im going back to 1 turn, tomorrow im going to change them to 1 1/2 turns. Then see how snappy it gets then. I really hope that works cause this is a great sled that just needs some tlc.
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 06:11 PM   #6 (permalink)
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sounds like you have more issues than jst the mixture screw setting. the mixture screw really only effects the lower end of the throttle range. If it is smoking and running rough when you pin it it may not be firing on all cys properly. Start with a compression test.

Read this link right through , lots of carb info in it

http://www.snowmobileforum.com/polar...need-help.html
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Old 11-27-2009, 06:23 PM   #7 (permalink)
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Its running 115-110 on all of them... I couldnt really make them all out on my tester but they look like they were all 115, compressions been the same since 2004 and the rings and pistons look immaculate also cause i checked today. Maybe one of my plugs are fouled.... Oh and im running on gas from last year too, but i mixed it with about a liter of fresh stuff soo that probably isnt it either. Its firing on all three cause i made sure soo ill rule that out.
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 06:30 PM   #8 (permalink)
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drain the gas, new gas, change plugs, 1 turn out, are the carbs in sync?
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Old 11-27-2009, 06:41 PM   #9 (permalink)
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Im not sure if there in sync. What do you mean by sync? Like are the idle screws set the same all around and the air screws set the same too? Im new with this... If you can explain it too me ill be able to tell you but i know that the carbs are set to the same on idle screws and i set all the mixtures the same also.
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 06:56 PM   #10 (permalink)
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a triple being in sync meens all three carb slides are opening equally and opening all the way. a senior member on here can give you links to do it yourself but I take the easy way out and take it to a shop. Triples are picky when it comes to carb sync. If not in sync a cylinder or two may be working against you.
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Old 11-27-2009, 07:04 PM   #11 (permalink)
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Okay i just went through the process of lookin how to sync the carbs.... Anyone know how much it may cost at a shop to get this done, Roughly? Cause that looks like one big pain in the ass!!!!
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-27-2009, 07:14 PM   #12 (permalink)
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I would start with the basics first. I bought a new to me 95 polaris sport last year. it had not run in two years. I tried to start it when I got home and it did the same bogging you described. Solution: new gas and plugs= a reliable sled. But to answer your question on my 96 XLT $480 for carb cleaning, sync, new jets, new carb boots, new exhaust gaskets(affect back pressure) and alot of crying but the sled screams now.
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Last edited by onlypolaris; 11-27-2009 at 07:32 PM.
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Old 11-27-2009, 07:23 PM   #13 (permalink)
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The plugs are brand new, and i have newer gas in it? Its been like this since last year, no power and i know a triple should be able to run like a raped ape through a field and mine was basically blah... It had power but not the power that it should have and now its got basically no power at all off the hop.
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-28-2009, 12:03 AM   #14 (permalink)
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It's all in the tuning, clutching, jetting and gears.. i have a 93 xlt 580 and i had the same problem and it sounds like what i was dealing with.. i chanced my needle and seats cause they were worn and it was loading up with gas that caused my bog...so i changed them out.. then i have had a little improvement but didn't have the snap in the begining so i went and grabbed a clutch kit, and i gear the sprockets down to get more lower end.. but it will still do 115 on a good packed trail..but your best bet is check the needle and seats and then check the carbs to make sure they are in sync..and yes it is
1 turn on the aur screw...i had a question where are you riding at and what jets do you have in it...i ride at 0'to 5000' feet and why i ask is cause the jetts they put stock in there are 200# and i had to switch them to 240# to get the right air fuel mixture...so let me know...
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Old 11-28-2009, 08:41 AM   #15 (permalink)
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240 mains sounds like way too much fuel for that engine!!! The factory jets them to run acceptably at 0 to 3000 ft in a temp range of -20 to +10 F . Even at that they tend to jet a bit rich to ensure there is little chance of a lean burndown. Normally you can squeeze a bit of extra performance out if you jet down a size.
And yes the sled was delivered to the dealer with 200 mains.
Something sounds mighty fishy about 240 mains unless you are running in like -70 temps. Also never seen ANY xlt 580 do a true 115 mph.

The warmer the air the smaller jet you will need

The higher the altitude the smaller jet you need

So when you consider the original jets are meant for sea level to 3000 and down to -20 for normal snowmobiling there is really now where to go but down in jet size not up!!

Aren't your plugs black?

I don't know maybe there is an air leak or something else wrong with your engine. Are there after market pipes on it maybe?
I can't really figure out why you would need 240 mains

olezy ...... make sure you are running on all three cyls , youve checked compression and that was good ....were the plugs all the same color like they should be?
start the engine and pull the plug wires one at a time and make sure all cyls are firing.
Assuming they are lets talk a bit about clutching, if you slowly apply the throttle and bring the revs up untill just the point that the clutch engages ....this is what is known as the engagement rpm. Anything lower than say 4000 and your primary clutch needs attention. If while riding on snow you open the throttle wide the rpms will peak and level off and even as the sled picks up speed the rpm will stay the same ....this is your operating rpm and it should be near 8000. If not you need to look at both clutches.
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Old 11-28-2009, 12:37 PM   #16 (permalink)
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well i here where you are coming from on the stock for this sea level to 3000'.. But i have dick with it for many years playing around and the 240 where what we ended up throwing in it to get it right.. but i maybe wrong on the set up for him...And yes i run the radar runs every year down here and in the right conditions with my set up my runs average between 108 to 115.. and that is the fastest i have had that sled.. but it is clutched and geared for when i run them...if i have it for just trail riding and ditch banging then i can get around 100.. Its all in the set up..on what i am running..but they way he explains it it sounds like he is loading up with fuel and just cutting the spark out of a cylinder.. i had the same issues with mine...
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1993 Xlt 580 Custom
DG Can
1.375 Inch "Intence" Track trim down from 1.5 inch
5" Inch Bar Riser with Custom Bar
EPI Clutch Kit
Geared Down
Plastic Ski's
XTRA-10 Fox all around

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Old 11-28-2009, 06:30 PM   #17 (permalink)
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When i took my carbs off there was a bolt in the bowl with a little circle in the middle (assuming this is the jet) It said 240 on it. And one of my plugs was comming out blacker than tobys arse. It was the one farthest from the clutch. I think my best bet is just finicking around with the mixture on the carbs until i get the proper one cause i looked at my plugs and they were grayish which means i was running way too lean, And that tells me way too much fuel and that can be flooding my plugs (I have a very strong spark on all of my plugs its a strong blue) im gonna just put a new tank of gas in and try it then.
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THREE IN A ROW'LL MAKER GO!


Never head into the bush without your morning wood.

93 Polaris Indy XLT SKS (BAT OUTTA HELL) - WISECO pro lite racing pistons, MBRP Can (Silencer), Fly racing bars /w 4" POWERMADD riserblock, 3" Paddletrack, and a Holeshot Skidplate (PURPLE)... V3

GIRLFRIENDS SLED!-> 96 Polaris INDY 440 - 6" POWERMADD riserblock /w MSR bars.
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Old 11-28-2009, 07:08 PM   #18 (permalink)
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I just sent you another private message about that, but anyways go back to the 200# or even the 190# jet cause the 240# is way to much fuel and you are loading up with to much fuel.. i know i said 240 before but by the sounds of you are gonna need to good back to the stock jet or the 190#.. or you will burn up your motor and it wont be pretty...
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1990 Indy 500

1993 Xlt 580 Custom
DG Can
1.375 Inch "Intence" Track trim down from 1.5 inch
5" Inch Bar Riser with Custom Bar
EPI Clutch Kit
Geared Down
Plastic Ski's
XTRA-10 Fox all around
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Old 02-03-2010, 09:26 PM   #19 (permalink)
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XLT carb settings

Just reading your thread i'm not sure if you have checked back in a while but i'm almost 100% i can help with your low end response issues. I also have an 97 XLT with 95 motor and messed with it for weeks when i bought it, the carbs are a little different because i have the ACCS but the principle is just the same. What most people don't realize with these triples is tha most don't get enough fuel at low end! I have been working with a family friend who owns a performance center with my XLT because i just didn't know what to do anymore. Someone had mentioned above clutching, which is a big issue. The factory clutch spring doesn't engage at a high enough rpm to give a good low end jump I found mine to be most snappy when i raised the primary to engage at about 4400 rpm which about 400-600 rpm higher than the stock setting. Now getting to that rpm off idle quickly is the issue. I would run 210main jets to make sure you don't get a lean burn down at full throttle as mentioned in another reply. Air screw should be 3/4 to 1 turn but the jet needle is what needs to be adjusted! The stock setting recomends that it be set in the middle, or third position. The jet needle controls fuel flow from 1/4 to about 3/4 throttle and these sleds need more fuel at low end! I know you mentioned it smokes like a wild fire and mine did to and its becasue there wasn't even fuel to burn cleanly and you had oil building up until you hit higher rpm and the main jet controlled more of the fuel flow! You have a lean bog! Adjust the needle jet one setting richer, so lower the clip one setting (therefore raising the needle slightly) and you should see a good improvement when hitting the throttle off idle. Also even though it says max rpm should be around 8000 rpm clutching it to run at 8200-8400 max rpm should give you a much better power band! Hope this helps! If you want to learn and understand more about tuning these carbs as well as anyone else readingt this here is a great link... Mikuni carburetor operation and tuning
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Old 02-04-2010, 01:34 PM   #20 (permalink)
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Great info XLTRMK600. I have a bog in the low-mid as well. My question would be this: if you didn't buy the machine new than its possible someone in the past threw in some 38mm carbs which would likely run a 240 main jet. A 190 or 210 would very likely be too lean.
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