Help -- '96 440 fan - HCS Snowmobile Forums

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Old 02-17-2020, 02:16 PM   #1 (permalink)
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Current Sled(s): 1996 AC Jag 440
Previous Sled(s): 1978, 1979 Scorpions - 1992 Ski Doo Formula + and 1986 Ski D
Location: New Paris, IN.
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19-20 Mileage: 2
18-19 Mileage: 500 ?
Age: 56
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Default Help -- '96 440 fan

Friday I rode about 65 miles - the last 25 the engine ran rough but was fine at the stops. I got back and discovered one plug had come loose - still threaded - but loose and oily. I put in new plugs but the sled wouldn't start. After sitting some hours - the sled started and idled fine. I took it back out and it ran fine for about 1 mile and then died. It sat - then ran again for a few laps of the parking lot - up to about 35 mph - but died with a backfire. Any idea what these symptoms indicate? Thanks.
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Old 02-17-2020, 02:45 PM   #2 (permalink)
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Perhaps a rebuild, 24 year old sled would have needed it a long time ago.
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Old 02-17-2020, 03:46 PM   #3 (permalink)
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Join Date: Oct 2014
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Current Sled(s): 1996 AC Jag 440
Previous Sled(s): 1978, 1979 Scorpions - 1992 Ski Doo Formula + and 1986 Ski D
Location: New Paris, IN.
Favorite Riding Area: Trail 3 in Western Michigan
19-20 Mileage: 2
18-19 Mileage: 500 ?
Age: 56
Riding Since: 2008
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Carb rebuild or pistons too? Thanks
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Old 02-17-2020, 04:41 PM   #4 (permalink)
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Current Sled(s): XCR 800
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You check compression??
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Old 02-18-2020, 06:19 AM   #5 (permalink)
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Join Date: Oct 2014
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Current Sled(s): 1996 AC Jag 440
Previous Sled(s): 1978, 1979 Scorpions - 1992 Ski Doo Formula + and 1986 Ski D
Location: New Paris, IN.
Favorite Riding Area: Trail 3 in Western Michigan
19-20 Mileage: 2
18-19 Mileage: 500 ?
Age: 56
Riding Since: 2008
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not yet --- just got home from the north.

Last edited by 92formula+; 02-18-2020 at 06:46 AM.
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Old 02-18-2020, 06:21 AM   #6 (permalink)
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tss...unplug kill switch and try it...that sled may have the carbs you have to bypass
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Old 02-18-2020, 06:46 AM   #7 (permalink)
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Join Date: Oct 2014
Posts: 201
Current Sled(s): 1996 AC Jag 440
Previous Sled(s): 1978, 1979 Scorpions - 1992 Ski Doo Formula + and 1986 Ski D
Location: New Paris, IN.
Favorite Riding Area: Trail 3 in Western Michigan
19-20 Mileage: 2
18-19 Mileage: 500 ?
Age: 56
Riding Since: 2008
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Unplug kill switch and check compression? It's a single carb. Thanks.
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