Jag 440 Engine Problems - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 10 (permalink) Old 09-20-2008, 02:16 PM Thread Starter
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Jag 440 Engine Problems

Ok Guys I'm trying to get this thing running before snow season so I can get it sold.

Machine: 1991 Arctic Cat Jag 440 AFS
Engine: 2 cylinder 440cc 2 stroke


I put a new topend kit in last winter, by the time I was done the snow was gone so I didn't ride it. I remember it wasn't running right after the rebuild either.

I went out today and tried starting it and it just wouldn't start for anything. I took the right side spark plug out and she started and ran pretty good on just the left cylinder. I put the sparkplug back in and it wouldn't start with or without the wire on......even if I put ether in.

ANY SUGGESTIONS OR THINGS I CAN LOOK FOR??

1991 Arctic Cat Jag 440 AFS
2003 Yamaha R6
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post #2 of 10 (permalink) Old 09-20-2008, 05:03 PM
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Is there spark on that plug?

Have you tried new plugs?

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post #3 of 10 (permalink) Old 09-21-2008, 06:58 AM Thread Starter
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thats the first thing I checked.......its got amazing spark. And the plugs are brand new. I got spark, fuel, and pretty good compression cuz its a bitch to pull with both spark plugs in.......not too hard to pull if I have the right one out.

Also, it sorta backfires when I have both plugs hooked up and I'm trying to pull the rope......but if I have just the left plug in and no plug in the rh side it fires right up.

1991 Arctic Cat Jag 440 AFS
2003 Yamaha R6
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post #4 of 10 (permalink) Old 09-21-2008, 07:12 AM
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Could you have put the right side piston in backwards? Sigle carb or twin? Maybe try switching carbs?
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post #5 of 10 (permalink) Old 09-21-2008, 08:09 PM
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Do a compression test on it and give us the numbers.

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post #6 of 10 (permalink) Old 10-24-2008, 10:35 AM Thread Starter
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Quote:
Originally Posted by kccats View Post
Could you have put the right side piston in backwards? Sigle carb or twin? Maybe try switching carbs?

I swear I'll kick my self REALLY hard if I did that.......that thought crossed my mind though, and its one of the first things I'm going to check. I know the arrow goes towards the exhaust but I'm pretty sure I checked it when I installed it but even the best screw up (and im not the best)

1991 Arctic Cat Jag 440 AFS
2003 Yamaha R6
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post #7 of 10 (permalink) Old 10-24-2008, 12:42 PM Thread Starter
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ok I tore the engine down and atleast the piston was in the right posistion. But I guess I installed the circlip incorrectly because it came out when the engine was running (it ran for 5 minutes after the rebuild and quit) The circlip rubbed a nice groove up and down the piston and cylinder, they are shot now. Mistakes costs money!! I'm gonna fix her and sell her to the first decent offer I get. We don't get enough snow here for a snowmobile to be worthwhile.

1991 Arctic Cat Jag 440 AFS
2003 Yamaha R6
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post #8 of 10 (permalink) Old 10-24-2008, 02:03 PM
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That sucks big time!! Sorry for your woes!!

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post #9 of 10 (permalink) Old 03-04-2009, 06:27 PM
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Hi I am new to this site. Sorry I don't neam to hijak this tread but I have a 94 arctic cat jag 440 fc deluxe with no spark. Changed plugs, replaced coil, cdi. Still no spark. have around 150 ohms reading on ignition coil. unplugged 4 wire harness and jumped the brown and black wire to eliminate any switching problems. no spark. This one has me stumped. I must be missing something. It was running great for several days but would not start one morning. Any help would be greatly appreciated. Thanks
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post #10 of 10 (permalink) Old 02-12-2010, 09:10 PM
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440 no spark!

it is your stator guaranteed! had the exact same thing happen even though my stator checked out good it was fubared replaced it got good spark now!
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