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Old 11-07-2007, 07:34 PM   #1 (permalink)
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Arctic cat 580 ext trouble shooting

i have an 1996 arctic cat 580 ext and has 4900 miles on it and i has been sitting for the last 3 years and i ran it last season and now it will not run this season. some things that i have done to improve this problem wich is it will start and u will have to give it 1/4 throttel and it will not gain any rpms no matter what i do i can mess with the choke and turn on the mixture screws all day and nothing. now i have replaced the fuel pump and all new fuel lines and filter and i have gone through the carbs and cleaned them. i have clear blue lines on it and the fuel will go throug to a cirten point and not go any more so im thinking the seals are bad in the crank case wich is not giving the vacume to the fule pump and is makeing it run lean it back fires through the exaust and carbs. if u have any idea wut is wrong i am set on thinking that i need to change the seals hole new gasket set wut do u guys think?
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Old 11-07-2007, 10:52 PM   #2 (permalink)
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Have you done a compression check?
When you cleaned the carbs, did you use spray cleaner or soak them?
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Old 11-08-2007, 07:04 AM   #3 (permalink)
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I agree with RJ I think it's in the carbs too! You say it did run last year after sitting for 3 years? Where the carbs cleaned then? The crank seals would let it run but at high rpm when you let off it would pop!
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Old 11-08-2007, 03:37 PM   #4 (permalink)
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yes i completly cleaned the carbs with carb cleaner jets needel seat every thing i did run a compression test on it and pto side had 95 and mag side had 105 wich i thought was low when i have seen 580 engines with 140psi
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Old 11-08-2007, 03:39 PM   #5 (permalink)
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also i have to add that it would not idel last year and the problem this year is that it will just bog and wont gain any rpms and will not idle
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Old 11-08-2007, 11:58 PM   #6 (permalink)
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Compression is too low.
120 or better is needed to run right.
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Old 11-09-2007, 06:01 AM   #7 (permalink)
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Re-ring it to get the compression up.
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Old 11-12-2007, 06:12 PM   #8 (permalink)
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580 compression

I did a compression test tonight and it 90 on one side and 95 on the other.I ordered a gasket and seal kit and new rings.this should help don't you think???
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Old 11-12-2007, 06:50 PM   #9 (permalink)
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possibly, also have been told by an artic cat dealership the crank seals are due around that mileage... if it helps any my friend has a ton of 580 parts
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Old 11-12-2007, 06:57 PM   #10 (permalink)
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580

does he have any working carbs for the 580?
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Old 11-12-2007, 07:00 PM   #11 (permalink)
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has both 38mm and 40mm carbs off 580s the earlier single port 580 i believe had the 38mm and later triple port 580 ( what u should have) has 40mm... between my friend and I we have lots of experience with 580s
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Old 11-12-2007, 07:39 PM   #12 (permalink)
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My son has this forum but has been asking questions for me so I am new to sleds.I think the carbs are a part of the problem to.We both bought our sleds from the same guy and his blew up almost right away and he rebuilt it and now mine has crappy compression and the guy we bought it from did work to the carbs but cannot remember what he did.So I figured just start over with good working carbs.
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Old 11-12-2007, 07:48 PM   #13 (permalink)
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Quote:
Originally Posted by safari man
My son has this forum but has been asking questions for me so I am new to sleds.I think the carbs are a part of the problem to.We both bought our sleds from the same guy and his blew up almost right away and he rebuilt it and now mine has crappy compression and the guy we bought it from did work to the carbs but cannot remember what he did.So I figured just start over with good working carbs.
its possible... how are the intake grommets that attach the carbs to cylinders? any cracks, leaks, etc? cylinders,head stock? never ported, milled? clutching fine? everything turns freely? has been sitting for 3 yrs too so possible something seized up...
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Old 11-12-2007, 07:56 PM   #14 (permalink)
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everthing is free'd up no cracks it ran well about a month ago till we messed with the jets now it will not get gas to the second carb.I can watch the gas go through the fuel filter and to the first carb and then the gas up the second line about 1/2 way and thats it.The comp.is low So I think I just bought a sled from the same guy my son bought one from and they were not taken care of at all.
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Old 11-12-2007, 07:58 PM   #15 (permalink)
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Also the compresion has dropped on that side to 90 from 105
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Old 11-12-2007, 07:58 PM   #16 (permalink)
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So I think it is time for a rebuild.What do you think?????
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Old 11-12-2007, 08:00 PM   #17 (permalink)
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Everything is stock.
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Old 11-12-2007, 08:17 PM   #18 (permalink)
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Quote:
Originally Posted by safari man
everthing is free'd up no cracks it ran well about a month ago till we messed with the jets now it will not get gas to the second carb.I can watch the gas go through the fuel filter and to the first carb and then the gas up the second line about 1/2 way and thats it.The comp.is low So I think I just bought a sled from the same guy my son bought one from and they were not taken care of at all.
do u know what pilots, main jets, air screw settings? does compression go higher if spray oil in cylinder? were the carbs soaked and then sprayed with compressed air or just sprayed with carb cleaner?
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Old 11-12-2007, 08:35 PM   #19 (permalink)
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mains are 360 amd pilots are 45's
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Old 11-12-2007, 08:36 PM   #20 (permalink)
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carbs were cleaned and put back together thats it
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