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Snowcat Adventure & Usage Forum Snow Trac, Kristi, Thickol/LMC, Tucker, Bombardier stories & discussions

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Old 03-02-2017, 10:42 PM
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Default Government Meadows run

As promised, I took the cat out today. I had a new colleague to train in driving. We ran it about 10 miles up to Government Meadows to haul the trash out and recover a burned up abandoned snowmobile. The cat ran great for the most part. I have noticed that once it's been running awhile if I let it sit and idle the carb gets hot and it vapor locks when we try to drive off again. At one point I had to lift the hood and cover it with a wet rag to cool it down. I'm thinking either it needs a heat shield above the exhaust manifold or a source of cold air. It has the 300 Ford six. It would be very easy to add a bilge blower type system to pull cold air from underneath and blow it on the carb. Any thoughts?

Can anyone identify the make and model of snowmobile that this pile of wreckage once was? I would like to find the VIN.
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Old 03-02-2017, 10:54 PM
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Default Re: Government Meadows run

Quote:
Originally Posted by PJL View Post
As promised, I took the cat out today. I had a new colleague to train in driving. We ran it about 10 miles up to Government Meadows to haul the trash out and recover a burned up abandoned snowmobile. The cat ran great for the most part. I have noticed that once it's been running awhile if I let it sit and idle the carb gets hot and it vapor locks when we try to drive off again. At one point I had to lift the hood and cover it with a wet rag to cool it down. I'm thinking either it needs a heat shield above the exhaust manifold or a source of cold air. It has the 300 Ford six. It would be very easy to add a bilge blower type system to pull cold air from underneath and blow it on the carb. Any thoughts?

Can anyone identify the make and model of snowmobile that this pile of wreckage once was? I would like to find the VIN.
That's definitely an Arctic Cat King Cat. My guess is 2003-2005. I can tell by the skid springs, floor board pattern and outer floorboard edging.
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Old 03-02-2017, 11:01 PM
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Default Re: Government Meadows run

I knew someone would know, thanks. The engine wasn't in the pile we have. It might be buried still. It's been there awhile.
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Old 03-03-2017, 12:01 AM
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Default Re: Government Meadows run

Yep looks like one of them go fast "HOT" sleds
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Old 03-03-2017, 02:44 AM
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Default Re: Government Meadows run

The burned up abandoned snowmobile.

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Old 03-03-2017, 06:41 AM
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Default Re: Government Meadows run

I once came upon a crispy sled that was obviously stolen then torched and abandoned. It was still burning when I got there but nobody around. I put it out with my fire extinguisher then called police.
I was out in the lamtrac grooming at the time.
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Old 03-03-2017, 08:42 AM
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Default Re: Government Meadows run

I've been having a similar issue of apparent vapor lock on my 300-6 but changing the fuel filter calmed it down.
If that doesn't help, try rerouting the gas line so it's away from the hottest places.
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Old 03-03-2017, 09:12 AM
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Default Re: Government Meadows run

It's a generic answer, but this is what I found.
https://www.reference.com/vehicles/c...milarQuestions

To locate the VIN on a snowmobile, go toward the right side of the vehicle and look toward the bottom of the side for the VIN plate. Normally, the plate is positioned on the body of the snowmobile about 3 inches beneath the lower edge of the seat. Also, the plate is located nearer to the rear side of the seat than its front.

A youtube version:

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Old 03-03-2017, 10:10 AM
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Default Re: Government Meadows run

Def an older zr mountain chassis prob 800 or maybe 900cc. The vin should be stamped on the tunnel right here . Back then I think they were only 7 digits or so where as the newer ones have letters numbers and much longer.
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Old 03-03-2017, 10:53 AM
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Default Re: Government Meadows run

If rerouting the gas line and changing the filter does not work, I used a heater motor from any 1970 to 1985 Chev pickup to blow air into the area around the carb in the past. I put a 440 Arctic Cat snowmobile into an Argo one time and the heater motor cooled the engine fine.
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Old 03-03-2017, 11:15 AM
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Default Re: Government Meadows run

Is there already an insulating plate between the carburetor and the intake manifold?
If you get the carburetor too cold it could lead to ice forming in the venturi. I have had this problem with aftermarket aluminum intake manifolds at sustained moderate throttle opening during cold temperatures near the dew point (cold foggy days). The cure there was a heater hose routed through a passage in the aluminum manifold to heat it slightly.
Is the fuel line getting hot or just the carburetor? If there is an inline clear filter or a way to install one at least temporarily it could allow you to see if the fuel is running clear or has air bubbles.
You can get pressure regulators with a return line back to the gas tank to keep the fuel lines cool and purged of air if that is where the problem is and if moving or insulating the fuel lines does not cure the problem.
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Old 03-03-2017, 11:17 AM
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Default Re: Government Meadows run

Track Addict, I have some steel wool and carb cleaner. I'll try scouring that area. It is still intact so I should have some success finding the stamped numbers.

Thanks Teamster. Any luck with a Coolcarb heatshield? More inclined to add a fan to deal with the heat though.
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Old 03-03-2017, 11:19 AM
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Default Re: Government Meadows run

GSSD, I'll have to look but my recollection is that there is no heat shield.
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Old 03-03-2017, 11:40 AM
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Default Re: Government Meadows run

My Sprite use to vapor lock too, usually after sitting when warm. I ended up putting an electric fuel pump from Napa on it and it solved the problem. The engine driven fuel pump's location seems to be in hot location and vapor locks easily. With the electric pump I was able to reroute the fuel line and keep the system cool.
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Old 03-03-2017, 01:22 PM
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Default Re: Government Meadows run

uou guys with vapor lock issues I would bet are all using rubber hose between the fuel pump and carb. replace it with a ss brake line should fix the problem. most guys don't like the hassle of dealing with inverted flare fittings ,but they used them at the oem level for a reason
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Old 03-03-2017, 09:57 PM
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Default Re: Government Meadows run

Thanks for the help on the Arctic Cat VIN location. Looks like the area I need to see is melted away. Unless.... All the pics I have found of the VIN location show that riveted plate stops further forward. And they are pop riveted not solid. Could this piece have been replaced and extended to reinforce it? If so then the VIN is hiding under that patch.

I'll tackle the carb issues next week.
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Old 03-04-2017, 09:06 AM
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Default Re: Government Meadows run

pete
getting a model number is a plus ,prior to rebuilding it.
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Old 03-04-2017, 08:04 PM
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Default Re: Government Meadows run

those military iron restorers state: 'if it isn't melted down it can be rebuilt"

This one is pushing it.....
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Old 03-05-2017, 10:54 AM
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Default Re: Government Meadows run

my sv200 would not idle after I ran it-----someone had built a new ss tank-----what I thought was maybe vapor lock----was my gas tank vent----the vent that wasn't there ---lol----run it with gas cap loose no problems
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Old 03-05-2017, 02:12 PM
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Default Re: Government Meadows run

That would be a nice easy fix.
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