One plug lean and engine cutting out mid throttle - ArcticChat.com - Arctic Cat Forum
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post #1 of 7 Old 05-22-2019, 04:09 PM Thread Starter
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One plug lean and engine cutting out mid throttle

2001 Mountain Cat 800 with carbs.....not EFI.

Rode the sled last weekend and it ran great. Towards the end of the day I was very low on fuel (Fumes) and had to use Lucas 2-stroke oil because that was all I had on hand (What I use in the Chainsaw), but it still ran great for the last hour or so of riding. Before

Took the sled out yesterday and filled it up with new fuel and AC synthetic oil. Started no problem. Let it warm up and took off. It immediately had a bog mid-throttle. Turned it off and checked plugs. The clutch side plug was dry (I run 40:1 so the plugs always have a wet look to them) and a lighter color than the other plug.

Started back up and took off and ran it hard (If it's going to burn a hole in the piston, I prefer doing it close to the truck). After awhile the bog went away, then came back but not as bad as before. I ride alone in the backcountry so decided to load up and come home (I'm getting old and don't find it fun anymore to be stranded in the middle of nowhere).

Any ideas where to start?
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post #2 of 7 Old 05-22-2019, 11:23 PM
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Not saying this is your problem for sure, and don't know if you run ethanol or not but fish out the fuel line in the tank and blow in the end. If air passes thru it, it has a hole in the line from ethanol. You may also have picked up some water running it that low. I use stuff called "Mechanic in a bottle" and will take water out right away. Best stuff I have ever used. Try the simple stuff first I guess.

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post #3 of 7 Old 05-22-2019, 11:33 PM Thread Starter
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Hi TCAT! I was hoping you would reply since you are the MC800 guru.


I have been thinking of head gasket leak (no loss of fluid, nor any bubbles in coolant reservoir), leak in the carb boots, bad CDI, bad regulator, etc etc etc, but never thought about water in the tank (I don't use ethanol). Now that you mention it, that would explain the symptoms perfectly.

Would Seafoam work? I always keep a few bottles on hand so if it works, that would be better than waiting for UPS to deliver.

Thank you so much!
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post #4 of 7 Old 05-23-2019, 07:35 AM
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Seafoam will allow the water to be burned up. Try it and see if it helps. It's possible that you may have junk in the carbs too if you don't have an inline filter.



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post #5 of 7 Old 05-23-2019, 07:57 AM
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Just to be clear......ethanol helps with water, allowing it to mix with the fuel. This is why when you use non eth fuel you should add isopropyl alcohol to stop water from collecting in the tank.

The ONLY time ethanol has a negative effect is when it sits for long periods as its eats rubber etc as mentioned earlier.

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post #6 of 7 Old 05-23-2019, 12:26 PM
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A 2001 with all original fuel lines is the first place I would look. Replace them all. Inside the tank is much easier than you think. it threads out from the front of the tank and once the airbox is removed, its a piece of cake. Replace the pulse line as well from the crank to the fuel pump. If you have those drain tubes under each bowl, its time for those too. Try to store the machine with non ethanol gas.



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post #7 of 7 Old 05-23-2019, 01:53 PM Thread Starter
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UPDATE: Fuel lines were all replaced last year, so I was confident they are not the problem. So, I poured a half can of Seafoam into the tank, pulled airbox off, disconnected fuel line, and let it drain for a minute or so to clear the line. Put everything back together and started. Let it warmup for a few minutes then applied throttle.

She purrrs now like a kitty now...............and the plug looks good.

Thank you for the help everyone! That was much easier than I anticipated. We just got a few feet of snow so I'm going riding this weekend. I love this global warming stuff!
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