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post #1 of 11 (permalink) Old 12-11-2009, 12:19 AM Thread Starter
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how do i adjust idle?

please help a real newbie out..I am the least mechanicly inclined person ever...I have 97 xlt touring...beautiful sled only 1750 miles on it..purchased this past summer. I had a local mechanic clean my carbs last month..Now that we finally have alittle snow to ride on I just had one question...sled seems to idle between 1800-2000 rpm...engine seems to run fine, so far no trouble, thing is great so far.. But the book says it should idle 1600 =/-200, which I take to mean mine is idleing alittle high...how do I adjust the idle down? is there an easy way to do this without screwing anything up? I really dont know much about this stuff, and would rather not mess with anything that can make things worse as I can not fix this myself... Im so mechanicly inclined that I cant even take my carbs off to clean myself...I thank you....
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post #2 of 11 (permalink) Old 12-11-2009, 12:38 AM Thread Starter
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also

it does seem to drop(idle) the colder it is out...is this normal? Like I said, for most part, it idles between 1800-2100
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post #3 of 11 (permalink) Old 12-11-2009, 02:09 AM
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I'm assuming you have three separate carbs on that engine. On the right side of the carbs is a small knurled knob. You will need to turn the knobs counter-clockwise equally until the RPM is where you want it to be. It shouldn't take much to drop 200 rpm. Try 1/4 of a turn on each carb and see how it runs.

Turning the knob counterclockwise allows the throttle slides in the carb to lower, which reduces airflow through the carb. Turning clockwise will raise the slides, increasing RPM.

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post #4 of 11 (permalink) Old 12-11-2009, 07:35 AM Thread Starter
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is this hard?

are these screws easy to get to? I dont want to turn the wrong screws....and also, should I turn these screws with the engine on or off? and I assume I do this after the engine has warmed up to proper temp?
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post #5 of 11 (permalink) Old 12-11-2009, 11:19 AM
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You should be able to turn 'em by hand, and with the engine running. There are only two screws to adjust; the idle screw is has a knurled knob, the air screw is smaller and has a slot for a screwdriver. You won't be able to turn the air screw with your fingers.

The critical thing is to turn each screw the same on all three carbs to keep the airflow through the carbs very close to the same. That will ensure smoothest idle as all three cylinders will be working the same amount.

If you choose not to adjust with the engine running, turn each screw equally a small amount and then start the engine to see the result. Both ways will work fine. I would also adjust on a warm engine.

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post #6 of 11 (permalink) Old 12-11-2009, 05:22 PM
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how does that efect the oil injection
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post #7 of 11 (permalink) Old 12-11-2009, 05:58 PM
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It doesn't

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post #8 of 11 (permalink) Old 12-11-2009, 06:53 PM
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oil pump is driven by the crank so when idle slows the pump slows

RIP 91 Polaris Indy Trail,
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post #9 of 11 (permalink) Old 12-11-2009, 07:20 PM
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Keep in mind that when the book says 1600 +/- 200 rpm, if its idling at 1800 rpm then thats the correct idle. I wouldnt mess with it if it were me.
You can use the knob thats on the carb rack if you really want to adjust the idle though. Make sure the engine has fully warmed up before you start adjusting the idle.

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post #10 of 11 (permalink) Old 12-11-2009, 09:20 PM
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i aree with Octane. i woulnt adjust it unless its pushing 2600. my colt idles on da at 1500 and the next at 3200. since it desnt engage till 4200rpm i dont me with it

RIP 91 Polaris Indy Trail,
85 Polaris Indy Trail... 488 motor from ^
74 Polaris Colt... custom 440 motor from ^
89 Ski-doo Formula Plus (521)
92 Ski-doo Safari L (377)... still in diagnostics phase

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post #11 of 11 (permalink) Old 12-12-2009, 02:51 AM
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Quote:
Originally Posted by Octane View Post
You can use the knob thats on the carb rack if you really want to adjust the idle though. Make sure the engine has fully warmed up before you start adjusting the idle.
I'm pretty sure the XLT had 3 VM Mikuni round slide carbs instead of the TM rack style... the rack style is a LOT simpler to adjust with the one knob on the rack!

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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