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post #1 of (permalink) Old 03-10-2000, 01:28 PM
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Fomula z 583 Jetting

I recently bought a 98 formula z 583 from my local dealer. Its a great sled but it has fouled plugs like every 4 cold starts. I took it back and they told me it was jetted for colder temps and that it would be fine just lay off the primer. I know its not a primer problem I thought maybe the jetting is too rich. Does anyone know what the factory jets are on VM40's? Or has anyone had the same problem? I can't afford to go and buy a new set of plugs every week. Thanks for the help


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post #2 of (permalink) Old 03-10-2000, 02:11 PM
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Re: Fomula z 583 Jetting

Your dealer could be right. Have you had a sled with a primer before? Some sled’s engines/primers are more sensitive than others, but flooding the engine with a primer is not too difficult to do. The best way to prime a sled (if your not sure of how well your primer is working) is to lift the hood and watch the fuel flow through the primer lines. I prime it until I see a solid stream of fuel in the line, then I prime it an additional one to two times.

As far as jetting goes, the 583's are typically jetted for -15 to -20 degrees F, but I would verify it by asking your dealer and by physically checking your main jets. If this is the case, you should be able to safely down size your main jet one or two sizes (if you are completely stock). However, FYI, the main jet has very little to do with fuel flow at idle (starting). You may want to look into your pilot jet sizing and/or your needle jets to aid your low end and “start-ability”.

GL - Adam

'99 MXZ 600 & '00 5.3 Silverado
post #3 of (permalink) Old 03-16-2000, 09:40 AM
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Re: Fomula z 583 Jetting

Hi i am actually from the chevy forum but i am an avid snowmobile racer so decided to join in this fun too.
Your stock jets should be somewhere in the range of 280 PTO and 310 MAG
not sure exactly but i know on my MXZx i have the VM34's and my stock jetting is 250 PTO and 260 MAG and on my 700 open i have 44's and my jetting is 320 PTO and 350 MAG so i figure you are between the two.
hope this helps.

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