1996 Ski-Doo Formula SL 500 Idle Issue - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 8 (permalink) Old 11-01-2011, 08:34 PM Thread Starter
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Post 1996 Ski-Doo Formula SL 500 Idle Issue

Good Evening,

Mark it as my first forum post ever... I'm looking for some advice; I'm an avid reader of forums and could not find a solution to my problem yet.

Problem:
I have a Formula SL 500 fan cooled that I picked up last week, when the sled idles it will die after about 10 seconds if not attended to. Either you have to be on the throttle giving it gas above 3500 RPM, or just a quick shot of choke, and then it’s good for another 10seconds. You can keep sled idle seemly forever, you just have to choke it for less than a second every 10sec or so.

What I did so far:
I went through and cleaned the crabs, like I do on every sled I have.
Drained the gas and oil
Refilled with premium fuel and some Sea-foam
Refilled with new oil
Tested the fuel pump

After doing this the sled behaves the exact same way as before. For some reason it just dies after 10 seconds unless you give it a quick choke shot.... And I did read some posts that said to check my sparkplugs incase too much oil was taking over the amount of gas that was getting into the motor (which I guess could be), but the plugs look great, better than a few other sleds I have... Overall the sled is very clean, and seemed to be well cared for.

Any help or suggestions would be much appreciated!

Thank you!
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post #2 of 8 (permalink) Old 11-01-2011, 09:19 PM
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When you cleaned the carbs, did you floss the passages?
The pilot jet is very small and is still plugged.

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post #3 of 8 (permalink) Old 11-01-2011, 10:07 PM Thread Starter
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Sounds good, I'll give it a go and try to re-clean that jet better tomorrow. Thanks!
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post #4 of 8 (permalink) Old 11-02-2011, 12:54 AM
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What RJ said or maybe you have a gross vacuum leak...crank seals or carb boots. If you're adding fuel with the choke to keep it running it makes sense that there's too much air or not enough fuel at idle.
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post #5 of 8 (permalink) Old 11-02-2011, 01:42 AM
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Quote:
Originally Posted by Skid View Post
What RJ said or maybe you have a gross vacuum leak...crank seals or carb boots. If you're adding fuel with the choke to keep it running it makes sense that there's too much air or not enough fuel at idle.
Skidoo boots have been known to crack between the carb and motor. When it runs give it a shot of starting fluid in the area if it revs up you have a cracked boot. if not try pulling your fuel pump and checking the seal and replacing the vacume/pressure lines.

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post #6 of 8 (permalink) Old 11-02-2011, 06:07 AM
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If that doesn't do it, you may have a problem with the center seal on the crank.

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post #7 of 8 (permalink) Old 11-02-2011, 08:24 AM
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If that doesn't do it, you may have a problem with the center seal on the crank.
How would you test for that?
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post #8 of 8 (permalink) Old 11-02-2011, 09:01 PM Thread Starter
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Hello all,

So I just finished cleaning the carbs for a second time, with extra attention to the pilot jet, though I don’t know how much cleaner I got them. Put it all back together and it did the same thing for about a minute, then all a sudden it started idling on its own…

The only other thing I can think of is yesterday when I was working and testing the sled it was around 55 degrees outside. Tonight it was around 50 in the garage just before I opened the door, but it quickly dropped to around 35 as it’s a lot colder outside tonight. Perhaps temperature plays a factor? Either way, seems to be idling great now ~1500 RPM.

Thanks for everyone’s help!
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