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post #1 of 10 (permalink) Old 11-06-2010, 09:15 AM Thread Starter
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96 formula sls 500 tunning

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Originally Posted by jefb View Post
Hello:
I have a 96 sls 500 that i just finishied rebuilding carbs and flushing out a contaminated fuel system. After setting everything back to stock setting as far as the jets it does not quite run right.
Here are my questions
*Is the main jet adjustable? I dont see how since it was removed it gets screwed all the way back in
* My manual says to adjust the air screw 1.75 (this means screw it all the way in and back it out 1.75 turns correct?
* I did not touch or adjust throttle cables so the only adjustment is the air screw and idle screw on the carb?

This unit does run but i have never tunned a carb before and it defffinetly has to be adjusted. Starts right up and will idle. Bogs heavily when accelerating. Also 2 times the engine has ran up high rpm even though the throttle was closed? i could physically see the slides closed but the engine ran away and the only way i could stop it was to cover the air inlets.
Which leads me too my last question can you adjust carbs with airbox off. Does this not effect the air ratio once you put it back on?

I understand air/fuel ratio but carbs are pre my erra. Only thing i ever troubleshoot is fuel injected.

Thanks
If you flip the choke on at low speed will it rev up properly?
Did you make sure that the pilot jet was clear? It is very small and clogs easily. A fine wire run through it will usually do the trick.

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Last edited by BC_Dan; 11-08-2010 at 09:57 AM. Reason: move question to top of thread
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post #2 of 10 (permalink) Old 11-06-2010, 11:21 AM
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does not have a choke only a primer
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post #3 of 10 (permalink) Old 11-06-2010, 06:26 PM
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Midrange fuel (25% to 75% throttle) is delivered from the main jet via the needle jet/jet needles. How are the needles set?

The 96 SKS 500 was either carb or EFI, the carbs should have had an enrichment circuit (chokes). The primer is probably after-market. Can you post some pics of what you have? That way we can get on the same page with you.

Here's a link to the Polaris website for parts diagrams, it may help you as well...

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post #4 of 10 (permalink) Old 11-07-2010, 05:11 AM
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main jet clear and pictures

i am sure that my main jets are clean and clear. Still cannot find a choke nor do i see the throttle cable choke connection that i have seen on previous sleds i worked on. Here is a picture of the carbs.

Thanks for the help
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post #5 of 10 (permalink) Old 11-07-2010, 07:28 AM
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I think I'm seeing things, Um... to me that looks like a ROTAX?
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post #6 of 10 (permalink) Old 11-07-2010, 10:32 AM Thread Starter
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You won't find any chokes on that, the small lines with the T connector are primers.

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post #7 of 10 (permalink) Old 11-07-2010, 07:12 PM
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Sure doesn't look like a Polaris 500 Silly me, I thought the OP was talking about an SKS, he's likely got a Ski-doo formula 500 SLS with a Rotax. If that's the case, I will move the thread from the Polaris forum to the Ski-doo forum so other Polaris owners won't weigh in with more choke info

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post #8 of 10 (permalink) Old 11-08-2010, 06:35 AM
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96 formula sls 500 tunning

Hello:
I have a 96 sls 500 that i just finishied rebuilding carbs and flushing out a contaminated fuel system. After setting everything back to stock setting as far as the jets it does not quite run right.
Here are my questions
*Is the main jet adjustable? I dont see how since it was removed it gets screwed all the way back in
* My manual says to adjust the air screw 1.75 (this means screw it all the way in and back it out 1.75 turns correct?
* I did not touch or adjust throttle cables so the only adjustment is the air screw and idle screw on the carb?

This unit does run but i have never tunned a carb before and it defffinetly has to be adjusted. Starts right up and will idle. Bogs heavily when accelerating. Also 2 times the engine has ran up high rpm even though the throttle was closed? i could physically see the slides closed but the engine ran away and the only way i could stop it was to cover the air inlets.
Which leads me too my last question can you adjust carbs with airbox off. Does this not effect the air ratio once you put it back on?

I understand air/fuel ratio but carbs are pre my erra. Only thing i ever troubleshoot is fuel injected.

Thanks
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post #9 of 10 (permalink) Old 11-08-2010, 06:45 AM
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sorry guys listed the wrong sled. Moved it to where it needs to be thanks
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post #10 of 10 (permalink) Old 11-08-2010, 02:41 PM
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Definately No choke on the '96 SLS, came stock with a primer button on the dash.
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