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post #1 of 15 (permalink) Old 01-06-2013, 07:47 PM Thread Starter
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High Idle

I have been reading several posts about high idle after running a while and needing to choke it to bring it down. I sprayed strarting fluid around the carb boots and the pto crank seal. No change in idle so I assume no leaks? Now how does one adjust the carbs after that. I noticed a screw in each carb with a white cap on it. I think it is to richen the mixture, but howthe heck do you get any tools in there to adjust? They are located on the right hand side of the carbs if you are sitting on the sled.

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post #2 of 15 (permalink) Old 01-06-2013, 09:00 PM
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I'm assuming Mikuni rack style carbs... you probably need to turn the fuel screws out a bit to give the idle air/fuel more fuel. If it has air and fuel screws, turn the air screw IN to give less air. The screws with the plastic on them are easy to turn by hand. A tool isn't really needed.

Before you adjust the screws, turn them both in until they lightly bottom so you know what your initial adjustment is. Then go out 1/4 turn at a time from that initial adjustment until the idle returns to normal. Initial adjustment should be equal and about 2 turns out from lightly seated on the fuel screw.

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post #3 of 15 (permalink) Old 01-06-2013, 09:11 PM Thread Starter
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Yeah..I can't get my hand in there to do it very well. I'll wait and bring it in the garage to mess with it. Thanks

04 700 Classic w/ M-10
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post #4 of 15 (permalink) Old 01-07-2013, 12:12 AM
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you need to rent a kid

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
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post #5 of 15 (permalink) Old 01-07-2013, 09:02 AM
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Just went through this as well.. Dan, helped me out.

Turning in the air screw "A in the picture" did the trick.. 1/4 turn. If you have it. i have almost 200 miles on now and no high idle..

http://www.snowmobileforum.com/polar...crew-turn.html
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post #6 of 15 (permalink) Old 01-07-2013, 09:32 AM
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Good to hear

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

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post #7 of 15 (permalink) Old 01-07-2013, 07:37 PM Thread Starter
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I have 4 kids to choose from :P

04 700 Classic w/ M-10
90 Indy 500, 11,XXX mi
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post #8 of 15 (permalink) Old 01-07-2013, 08:21 PM
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Ahhh, spares! My problem is both my kids are as big as I am

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
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post #9 of 15 (permalink) Old 01-20-2015, 05:10 PM
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Hi I need help 2002 800 xc sp 4750 miles.
It starts and idles fine until you drive it even 100 feet, the idle will not come down unless I blip the choke.
I had the carbs gone through by a dealer and they did compression check 125 each cylinder.

They said that there are no leaks at the carb boots and I did the crank seal test and the idle did not change.

I am starting to think that it is the gaskets between the two piece carb themselves.

Thanks
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post #10 of 15 (permalink) Old 01-20-2015, 05:37 PM
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Have you turned the fuel screws out? A lean condition that causes a high idle can often be solved by a bit more fuel at idle. Try 1/4 turn out on each fuel screw to see if that helps.

If it's very persistent and not resolved by adjusting the fuel screw, you may have to change the pilot jet to one that is a bit larger.

2007 Dragon RMK 700 155", 2008 RMK 600 155", 95 Prowler 550 2-up, Really OLD AC Cheetah

http://www.avalanche.org/accidents.php
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post #11 of 15 (permalink) Old 01-20-2015, 08:36 PM Thread Starter
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I'll try that too. Thanks

04 700 Classic w/ M-10
90 Indy 500, 11,XXX mi
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post #12 of 15 (permalink) Old 01-20-2015, 09:06 PM
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thanks I will give it a try.
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post #13 of 15 (permalink) Old 01-20-2015, 09:18 PM
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Mine did the same thing. I tinkered for a long time with the fuel screw. After removing both and comparing them I found one to have a broken off tip. Removed tip and replaced screw...all fixed.

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post #14 of 15 (permalink) Old 01-20-2015, 10:56 PM
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How did you get the tip out?
If I take mine out and check mine I screw it in but not tight than how many turns out?

Thanks
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post #15 of 15 (permalink) Old 01-20-2015, 10:59 PM
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I blew air through the exit side of the port (cylinder side has small hole). I cant remember what I am set at. I think around 1 and an eighth out from lightly seated but not sure. Not near sled now.

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