Crankcase has too much oil - ArcticChat.com - Arctic Cat Forum

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post #1 of 7 Old 09-12-2008, 07:41 AM Thread Starter
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I have an 2004 Arctic Cat 650 with the Kawasaki engine. While I do work it hard (cutting wood, playing), I do take very good care of it. I always change the oil and use the Amsoil and pretty much follow all of the recommendations of the dealer.

Yesterday I walked in the garage and there was a big puddle of oil under the machine. I traced it up to the drain in the breather/air filter box. There was also a big puddle of oil in the breather box. I checked the oil level in the machine and it is way over full. The dealer suggested there is gas leaking into the crankcase due to a stuck or dirty carb pin and it is pushing up into the breather box from the crankcase. His only suggestion was to change the oil and turn the gas off when I am not using it.

Has anyone every ran across this before? Is there some other solution aside from turning off the gas?

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post #2 of 7 Old 09-12-2008, 08:01 AM
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Couple options here. I agree with your dealer in that gas is filling up the crankcase. I had it happen on my 04 V2 as well, bujt only when I trailered it with the fuel pet cock turned on. I turned it off when trailering after that incident and had zero problems. So, with that said, it wouldn't be a bad idea to turn it off if you're planning on leaving it sit a while.

Another thought is that you could have some crud in the carbs that is preventing the floats from seating fully, which causes more fuel to trickle into the carb, fill it up, then go into the cylinder, then down past the rings into the crankcase, thus filling it too far.

Those would be my two starting places.
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post #3 of 7 Old 09-12-2008, 02:18 PM
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Sanny is right, Clean the Carb, then install a new NEEDLE AND SEAT. Should solve you problems. If the machine is setting
for long periods, or you are trailering it, Shut off the gas petcock.

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post #4 of 7 Old 09-12-2008, 04:44 PM Thread Starter
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It sounds unanimous then. I'll clean the carb and change the oil. Thanks so much Sanny and quadman (nice quad, by the way). Since I got the 650, I haven't had to do anything to it except routine maintenance. I have been pretty amazed with the machine. A far cry from the old Kawasaki 110 and Yamaha 225 3 wheelers and the Polaris 325. I can only imagine the Thundercat 1000. Sounds like a blast.
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post #5 of 7 Old 09-12-2008, 05:04 PM
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I'm surprised no ones asked yet.

Can you smell gas in the oil? You should be able to smell it easily if it's getting in there.

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post #6 of 7 Old 09-13-2008, 09:51 AM
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I would check to make sure you can change the seat. The needle is replaceable, but on some carbs the seat is not.
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post #7 of 7 Old 09-17-2008, 08:57 PM Thread Starter
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ATV: 2004 Arctic Cat 650
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Sorry so long on getting back. I have been out of town.

The gas smells present, but is not overpowering. Oil seems less viscous than normal and is twice as high up the stick as the full mark. I do all of the maintenance and can say pretty confidently that I did not fill it that full after the last oil change. Amsoil is expensive so I use exactly what is required.

I appreciate all of the input. This weekend, I will change the oil and look at the carb. Thanks.
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