98 XC 600 Carb jetting help - HCS Snowmobile Forums

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Old 12-05-2011, 03:17 PM   #1 (permalink)
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Default 98 XC 600 Carb jetting help

Hello all, new to the forum and google searches keep popping up threads on this site so here I am. I bought a 98 XC 600 this fall and came with extra jets. I already opened them up, cleaned, and ran it yesterday. Besides being cold blooded like my old 700, it has what seems like a dead spot at low throttle. Snap the throttle to wide open and sometimes backfires then goes right to the powerband. But it doesn't do this every time. The plugs are clean zinc color at the base of the threads, porcelain is tan, and electrode is wet and black after about 10 miles on the trail.

Knowing that stock is on the rich side, Id like to run slightly leaner jets since it did come with these extra jets. Sled is 3k mi, stock pipe, stock motor, airbox, vforce, and will be riding under 1000' altitude. My thought is to either put the stock pilot jets back in or move the needle clip 1 position richer (not sure which end is position 1).

Pilot: 42
Main: 182
Needle: 1368, clip on middle position
Airscrew: 1 turn

Thanks for the help!!
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Old 12-05-2011, 03:27 PM   #2 (permalink)
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Welcome to the best site fo rinfo on the 98 6's an 7's. Leave the stock pilots and you can safely drop the mains to 182 for any conditions you will find here in MN to -10 but watch it on the really long lake runs. Air screw closer to 3/4 to 7/8 turn may help clear up the hesitation off the line, but SLP power packs will definitly do it.
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Old 12-05-2011, 03:36 PM   #3 (permalink)
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Power packs? I hope this is something other than a boost bottle, I put one of those on my 700 and could not tell any difference. Thanks for the fast response!
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Old 12-06-2011, 01:23 AM   #4 (permalink)
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The Keihins are touchy on the airscrews. 1/8 turn is noticeable.

38 pilots and 1371G needles really clean up the bottom.
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Old 12-06-2011, 10:54 AM   #5 (permalink)
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Quote:
Originally Posted by fez View Post
The Keihins are touchy on the airscrews. 1/8 turn is noticeable.

38 pilots and 1371G needles really clean up the bottom.
Im not sure what the difference is in the needles but are you thinking the pilot is still rich running a 42? I have 40's I could throw in too but thats the smallest pilot that came with the sled. I will mess around with the airscrews on this current jet set up to see if it clears up too. Also looked into those power packs, for $70 I will just mess with the airscrews. Besides, the wife already isnt happy I bought the sled, less money spent on it the better. lol
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Old 12-06-2011, 07:05 PM   #6 (permalink)
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IF you don';t want to go get some stock 38's, the 40's will work. Going to need air screws out around 1 1/2 to 1 3/4 tuens to get enough air to balance them out. Once you try the power packs on one of these you will understand the $70.
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Old 12-06-2011, 11:44 PM   #7 (permalink)
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Isnt the lower the number, the leaner the jet? My supplement says 45/185 for the 600 and 38/185 for the 700. Id think there would be a jet difference on the mains instead, dunno. I will try screw adjustments this weekend and if there is still a hiccup, I'll change jets. Also going to check if power packs are available locally.
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Old 01-05-2012, 11:06 AM   #8 (permalink)
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Default 98 xc600

Hello,
Just wanted to comment on your XC6. I bought mine new at the end of 1997. It now has over 8300 miles. It is absolutely the best sled I have ever owned. Very low maintainence. Here's my set up on the carbs: 178 mains, 45 pilot jets, 1 turn out on the air screws, boost bottle, SLP Power Packs, and V Force Reeds. Most of our riding is in Northern PA. 1000 - 2000 ft elevation. We rarely see temps below 10 deg.
One other suggestion, the water pump belt doubles as the oil pump drive belt. If you're not sure if it has been replaced - replace it. You have to get it from Polaris...about $30. Not too bad a job to replace.
Hope you get as much enjoyment out of your XC6 as I have!
Happy New Year, George
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Old 01-05-2012, 11:17 AM   #9 (permalink)
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I put a 98 600 together last winter , I done alot of reading on here and it seemed as though the keihen carbs needed alot of stuff to make them work alright and even then would need constant adjustments to keep em tuned in . So I got rid of the keihins and put racked mikunis on it and am very happy I did . If you do the waterpump belt check the deflection , if there is too much then you may have to replace the pulleys as well .

Last edited by OldPolaris; 01-05-2012 at 11:19 AM.
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Old 01-06-2012, 07:25 PM   #10 (permalink)
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Quote:
Originally Posted by OldPolaris View Post
I put a 98 600 together last winter , I done alot of reading on here and it seemed as though the keihen carbs needed alot of stuff to make them work alright and even then would need constant adjustments to keep em tuned in . So I got rid of the keihins and put racked mikunis on it and am very happy I did . If you do the waterpump belt check the deflection , if there is too much then you may have to replace the pulleys as well .

That is because Polaris is stupid. Every year, and even between models in the same year Polaris had a different set up in the Keihins.

Many have posted what works and once you get it right a simple airscrew adjustment at the beginning of each day, depending on temps is all they need.
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