Artic cat 580 EXT problems - - Arctic Cat Forum

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Old 11-30-2010, 05:35 PM   #1
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Artic cat 580 EXT problems

Hey guys,

Ok, I have a '94 580 EXT and I'm am having problems with it.

First off it just wasn't running well, It would go good for a while then I would lose all my rpms and would have problems getting the engine revved up past 1000 rps, It would also die if the rpm's got to low and wouldn't be start-able for about 15 min. It then progressed to overheating (even while idling) and a lot of the antifreeze would boil out (It would blow off the hose on top).

I ripped the heads off and the pistons seemed sticky like antifreeze was inside, I checked the seals and gaskets but they looked good (could be bad, i'm no expert)

I friend suggested just taking out the thermostat and also the little o-ring in the head got to hot and is leaking. I also haven't been into the water pump yet but maybe something wrong with that could cause the overheating?

Was hoping to gain a little insight on this so any help you guys could give would be great.


Last edited by Lotto; 11-30-2010 at 05:39 PM.
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