1991 Artic Cat JAG 440....Lost Spark - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 12-29-2008, 02:02 PM   #1 (permalink)
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1991 Artic Cat JAG 440....Lost Spark

This is my very first snowmobile i have ever owned...take that into consideration....I only paid $250. And ran good for a consecutive 3 weeks...with minor bogging.

Last week my son was riding the snowmobile out on the lake...He was going no faster than 45 mph. After about 25 min. of riding the whole machine just seized up...track, ignition, pull cord...etc. I manually turned the clutch and freed up the engine but still no fire....I had help and towed it back to my house....after about 10 mins of sitting i pulled the plugs and had spark...the machine started right up...running just a little out of the ordinary.. 1 plug looked like the piston had hit the bottom closing the gap. I replaced plugs with BR8ES. The machine ran fine but would not idle...here it is a week later only ran it a few more times at 20 min intervals....yesterday (dec 27. 2008) the machine started right up and ran for about 10 mins or so.. covered it up for the night....today i went out to start the machine...no fire to the plugs... But everything else worked just fine...lights...etc. Has anyone encountered a problem similar to this...if so i need some advice...

thanks.
icesledder

P.s. I just bought this machine 1 month ago from previous owner who told us that it had been sitting in his barn for abou 3 years. After recieving the machine i did a manual tune up on the basics...oil, fuel, plugs, wires...etc. It was running when i bought it with just a little bog...Because of the Bogging i could not get the machine above 60mph. Again any info would be helpful.

To see pic. of snowmobile please visit my profile.

Last edited by icesledder; 12-29-2008 at 02:14 PM. Reason: added pic
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Old 12-29-2008, 07:00 PM   #2 (permalink)
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Start with cleaning the carb (s) ! Did the plugs look white or gray or black? Could the engine have siezed up? How much did it smoke? How muck oil has it used?
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Old 12-29-2008, 07:43 PM   #3 (permalink)
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the engine did seize but i got it to spin. the oil is pretty much using a quart per tank of fuel the plugs were alittle burnt. the sled doesnt smoke at all but now when its trying to idle i smell the fuel now. today i went to start it and no spark. as you read this i ran the sled about 50 miles since that happened like i said today no spark.
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Old 12-30-2008, 07:49 AM   #4 (permalink)
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Start with a compression test.
My guess is that it has seized rings and you also have switch issues.
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Old 12-30-2008, 08:31 AM   #5 (permalink)
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i got about 108 per cyclinder i think it might be low i dont know. i read where people were bypassing the 4 prong plug by jumping black and brown together,do i leave the plug plugged in when i do this or unplug it then jump them? im learning all i can about this sled so all info is greatly app. i have a single carb on this when taking it apart what should i be looking for? how do i tune it when i put it back together?

thanks alot, icesledder









?
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Old 12-30-2008, 08:39 AM   #6 (permalink)
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108psi, is that three or more pulls with throttle held wide open, or just one pull?
108 is too low to run well if at all.

Should be 120psi or better.

And yes, unplug the 4way and jumper the brown and black wires together. This bypasses all the switches. to shut off the engine, just remove the jumper.
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Old 12-30-2008, 09:46 AM   #7 (permalink)
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i was stranded on the lake the guy that towed me in had a tester, we put it on one cylinder and pulled just once and didnt have the throttle open. im going out now to bypass the switches to see if i can get spark. ill be back later to check site. thanks again....icesledder
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Old 12-30-2008, 11:26 AM   #8 (permalink)
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funny thing i went out this morning and just for the heck of it i pulled on the sled and it fired right up ran about 25sec and quite no spark. what do u think about that? so i spliced the b-b wires and it runs. how do i know what switches are bad?how do i fix it?any ideas? now i got it running again how do u get the carb set close to where it should be?i cleaned it it didnt look dirty but i cleaned it anyway.now just trying to figure the carb it smokes alittle now when its at an idle,but seems to run good dont want to run it till i get close with the carb. thanks alot ........icesledder
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Old 12-30-2008, 02:07 PM   #9 (permalink)
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Ok, it seems to run right now?
Unplug each of the switches including the one under the handlebar pad and jumper them all.
Reconnect the 4way and start it up again.
Then reconnect each plug one at a time until you lose spark again.
My bet is that the throttle safety switch is bad, or that you need to replace the throttle lever bushing.
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Old 12-30-2008, 03:08 PM   #10 (permalink)
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cant tell u how helpful u been. i did what u said and the problem is the switch in the handlebars. also my throttle lever is super sloppy like the bushings are gone. how do i fix that just new bushings? or do i have to replace it? is that the throttle switch that is bad or my kill switch? now that its running how do i tune the carb to get it close? again u have been a great help im learning what to look for now. thanks again...........icesledder
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Old 12-30-2008, 06:48 PM   #11 (permalink)
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You can just replace the bushings in the throttle.
If you want to, you can remove the TSS from the kill switch. Kckats can tell you how to do that, just PM him.

Start with you idle set at 1800rpm.
Before starting the engine, turn the air screws in till gently bottomed and open 1 full turn.
Start the engine and see what the idle speed is, adjust to 1800 again if needed, then turn teach air screw out 1/8 turn at a time until the rpms start to climb (should be about 1 1/2 turn out now) set idle again and you are done.
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1980 AC Pantera (donor engine to the 90 wildcat)


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Old 12-30-2008, 07:01 PM   #12 (permalink)
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do you mean adjust the cable once im at 1800 then do the screw adjustments?i have 2 screws,one on the side in middle of carb and a small one bottom same side both all the way in to start?
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Old 12-30-2008, 07:07 PM   #13 (permalink)
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Yep, have the throttle tied open so that the slides are all the way up in the carbs.
The bottom of the slides should be flush with the top of the bore. Adjust by the cable adjusters on the top of the carb if needed.
Then let them bottom out and make sure that all are set at the same height by using a 3/16 drill bit (shank end) and adjust idle stop screws until you have an even pull on the bit on all three.
The idle stop screws are the ones with the springs on them and the air screws are the little ones near the airbox end of the carb body.
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'93 Wildcat 700EFI
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'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


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Old 12-30-2008, 07:17 PM   #14 (permalink)
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sorry to say i know very little about this carb my sled is a single carb. i dont know what the slides are. i feel stupid ,how do i know what im lookin at?
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Old 02-01-2009, 11:16 AM   #15 (permalink)
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I wouldn't run BR8ES in that for very long. I'm pretty sure they will start to burn a hole in your piston.
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Old 02-02-2009, 04:49 AM   #16 (permalink)
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Ok, you can disregard the synch info then.

On the side of the carb there is a screw with a spring on it. That is the idle speed adjuster screw. Turn it in to raise the idle. Set the idle at 1800 rpm by the tach. (best to do this with the sled propped up off the ground) then turn the the smaller screw in (in 1/4 turn increments) until the rpms start to climb. Then reset the idle rpm back to 1800.
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'93 Wildcat 700EFI
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'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


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Old 02-02-2009, 12:35 PM   #17 (permalink)
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Talking

thanks for the info. the cat is fine it runs great idles great but no top speed 55-60 is all i can get i put new belt on and still the same the clutch is smooth and seem to be working fine. i dont know how fast this ssled should be but im trying to get it close to how it ran new. any thoughts would be helpfull thanks
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Old 02-02-2009, 02:58 PM   #18 (permalink)
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That's all you're going to get from a Jag.
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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

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