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Old 12-21-2010, 01:46 PM   #1 (permalink)
99' Polaris RMK 700
 
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Question 96' Arctic Cat 440z jetting ???

Hello I just recently bought an Arctic Cat 440z for $600 with 3700 miles on it. The previous owner used it to get to his cabin at 8500ft in elevation. He also used C12 racing fuel for the elevation. My question is i'm asuming he had changed the jetting in the carbs. I dont want to run the C12 racing fuel b/c it burns to hot for a fan cooled engine. I also did a compression test and got 130 psi cold on both pistons. Another question I have is at 3200ft it drove on to my trailer and ran fine (where I bought the sled) I live at 97ft elevation sled starts and idles fine but when I give it gas it dies. And one carb boots to the airbox is cracked and needs replaced. Also where the main jets are on both carbs theres 1/4" tubing that stubs down like 6" with a plug. It doesn't appear to be stock. Any help will be greatly appreciated I will post some pictures later. I forgot to mention that I'll be running the sled between 5500'-6500' elevation and -20_0 degrees
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Old 12-21-2010, 03:38 PM   #2 (permalink)
99' Polaris RMK 700
 
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440z

here is some pics to give you an example
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96' Arctic Cat 440z jetting ???-1.jpg   96' Arctic Cat 440z jetting ???-2.jpg   96' Arctic Cat 440z jetting ???-3.jpg   96' Arctic Cat 440z jetting ???-4.jpg   96' Arctic Cat 440z jetting ???-5.jpg  

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Old 12-21-2010, 04:09 PM   #3 (permalink)
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If you look on the plate that lifts up that covers the belt on the clutch side there is a list of what size jets you should be running at different elevations and with different temperatures. Its that way on my '94 and I would assume its the same on yours. You probably will have to replace that boot which could require a bit of work if the carbs were not taken off and cleaned regularly as the carbs like to freeze up in the boots and not come off. Also my carb has that same hose coming out of it on the bottoms, I believe it is a drain hose of some type. Maybe someone with more knowledge will be able to come on here and clarify it for the both of us.

Happy sledding,
Mike
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Old 12-21-2010, 04:25 PM   #4 (permalink)
99' Polaris RMK 700
 
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Hey Mike, thanks for your input I do have a chart for jetting on the clutch cover. Just not sure why he was running 112 octane. I changed plugs oil and gas 87 octane. Also I haven't taken it out for a test ride yet maybe the drastic change in elevation is causing it to die when i hit the throttle after its warmed up??? like i said in my first post it ran fine at 3200' we ran the track on a stand it didnt bog or die. Also it idles at 1500rpms does that sound right
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