Sportsman cam pics.... - Polaris ATV Forum
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post #1 of 28 (permalink) Old 02-07-2011, 11:37 AM Thread Starter
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Sportsman cam pics....

This seems to be a problem with the sportsmans. The exhaust lobe on the cam wears off. I think that my carb float neeedle and seat being worn out caused this. I noticed that I had fuel in my air box. Drained it and didnt think anything else of it. Put a new needle and seat in it. Turns out that about 3 weeks later I realized gas had also filled my motor and diluted the oil so much it was like water. I also noticed it had very tiny sparkles in it. Messed with the carb thinking I had a clogged jet. Read somewhere someone said to check the exhaust lobe on the cam. Finallly popped the valve cover and found a bad cam. Here are pics of the cam and the exhaust rocker arm. Both are trashed.



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post #2 of 28 (permalink) Old 02-07-2011, 11:43 AM
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one problem the earlier sportsmans had was that sometimes the metal oil tank will collect condensation and because the oil flows near the bottom of that tank it can make the oil insufficiant if its not changed more often, they fixed the problem with the newer sportsmans plastic oil tank. it can be switched out.
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post #3 of 28 (permalink) Old 02-07-2011, 11:44 AM
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also always run polaris oil
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post #4 of 28 (permalink) Old 02-07-2011, 02:49 PM
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Wow, that's an incredible picture. Sorry to hear. Did you notice a lot of metal in the oil? I would think with that amount of damage it would show itself when an oil change is performed.

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post #5 of 28 (permalink) Old 02-07-2011, 03:24 PM Thread Starter
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Yes, I said that I did. Qoute "Turns out that about 3 weeks later I realized gas had also filled my motor and diluted the oil so much it was like water. I also noticed it had very tiny sparkles in it."
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post #6 of 28 (permalink) Old 02-07-2011, 04:01 PM
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My bad. I had a similar issue in the fall but it was an intermittent issue. She would run for a while and then wouldn't run. She seems to run fine now but for piece of mind I'm going to pull my valve cover this spring to check the cam

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post #7 of 28 (permalink) Old 02-07-2011, 04:22 PM Thread Starter
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Yea the big pics make it hard to read sorry bout that.
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post #8 of 28 (permalink) Old 02-08-2011, 09:10 AM
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How big of a task is it to get the valve cover off? I take it you have to remove the air box, front plastic, and gas tank?

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post #9 of 28 (permalink) Old 02-08-2011, 12:34 PM Thread Starter
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Isnt a big deal to me. But, I suppose its just up to each person on how far they are willing to go with any repair. It took me about 10 minutes to have the front clip plastics, gas tank removed.
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post #10 of 28 (permalink) Old 11-10-2012, 12:26 PM
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Well I looked at the cam. There isn't much of a exhaust lobe. Has a real shape lobe and rocker arm is worn and has a groove. The exhaust lobe isn't really a lobe. Just goes up a little bit the flattens off and looks scored bad.
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