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Polaris: GEN 1 and older 1998 and older, all models in the Gen 1 Indy chassis and older chassis models
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  #1  
Old 08-22-2017, 03:58 PM
trussell456 trussell456 is offline
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Default 98 RMK 600 jetting help

just picked up a 98 rmk 600. guy used to ride it in colorado, brought it to Maine four years ago and ended up putting 50 miles on in those four years.

When i bought it he told me he adjusted the clutch for the altitude change but i never thought to ask if the carbs got adjusted.

I found info in the service manual about factory jetting, which i assume is for higher elevation than i will find in Maine. I havent pulled the carbs apart to see what the jetting looks like, just looking for a starting point for when we get snow.

Factory jetting is 160 mains and 45 pilots with the jet needle in the #2 position.

Now looking at the xc 600 factory jetting, 185 mains and 45 pilots with the jet needle in the #3 position. Should i just use this as a baseline to start with once snow flies and adjust accordingly? or does anybody who has more experience with this engine have a better suggestion?

Im not a professional mechanic by any means but i do understand the concept of jetting, kind of just want to know where to begin
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Old 08-22-2017, 04:49 PM
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Get a OEM jetting and clutching chart for that year/model, it will clearly state what your baseline should be by elevation. If the rest of the motor is stock, you should be golden. Different models can have different jetting specs, based on specific carbs, exhaust, etc., so just a same year/cc could be different. You want to crack the carbs, too, and verify the main, pilot, and needle, and needle position, all of them, and set the air/fuel screws, and any slides, to spec, too. Pretty easy, but, important to avoid issues. FWIW. Good luck.
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Old 08-24-2017, 10:10 AM
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Thanks I must have overlooked that the first time looking in the service manual. Got a baseline all set, just waiting on the snow to fly in a few months now
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Old 12-27-2017, 04:46 PM
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So we got some snow and ive had a chance to try out the sled. Once warmed up the sled runs excellent, idles at about 1600 or 1700. The issue I'm having is before its warm.

Sled starts up 2nd or 3rd pull its hard to keep running for the first minute or so, most carb'd sleds ive owned will stay running by just giving half choke a few times if it sounds like its going to die, but this one i need to keep giving it throttle and it just doesn't sound right. A few times its died and then backfires when i pull the cord again.

Is it normal for this engine or do i need to adjust something?
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Old 12-29-2017, 12:48 AM
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The keihin carbs are notorious for being a bit weak on the fuel enrichment circuit. In 1999 they added a primer to aid cold starting because of that although you say yours starts in a couple of pulls. I used to start it and leave it on full choke until it started to run really rich and then to 1/2 choke after that for a while. You could turn the air screw in from recommended setting to see if that helps or go up one size on the pilot jets.
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Old 12-30-2017, 11:46 AM
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Didn't get a chance to jet the pilot up as i only have one other set of pilot jets and they are lower. I did start the sled this morning and it took 8-10 pulls instead of the usual 3, once it started i kept it on full choke for about 30 seconds while continually blipping the throttle to keep it from dying.

Sled seems to be running only one cylinder at the time, and at about the 45 second mark of running sled pops a little and sounds like its running on 2 now and starts idling by itself no problem.

What would cause the sled to run on one cylinder for a minute then jump to two. It seems to do it every time from a cold start. Once warm it runs good
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Old 12-30-2017, 03:36 PM
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let it sit a few hours and tried again, this time with the air box off. this confirmed running on one cylinder for a few seconds, the pto side was firing mag was not, then the mag starts firing all of a sudden.
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Old 12-30-2017, 04:58 PM
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Are the plug caps on the wire securely and the metal part of the cap that contacts the sparkplug in good condition? I've seen a misfire when cold when the plug cap was not securely screwed into the wire.
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Last edited by retiredpop; 12-30-2017 at 05:00 PM.
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Old 12-30-2017, 05:13 PM
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Quote:
Originally Posted by retiredpop View Post
Are the plug caps on the wire securely and the metal part of the cap that contacts the sparkplug in good condition? I've seen a misfire when cold when the plug cap was not securely screwed into the wire.
Earlier today i unscrewed the caps and cut a little bit off the wires and reinstalled, and made sure to screw back in tightly
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Old 12-30-2017, 05:15 PM
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Old 12-30-2017, 05:16 PM
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Old 12-30-2017, 05:23 PM
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Old 12-31-2017, 10:24 AM
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Old 12-31-2017, 11:56 AM
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Old 01-16-2018, 08:52 AM
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Old 01-16-2018, 06:29 PM
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