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Old 10-17-2011, 09:06 PM   #1
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mountain cat problems

I bought a 2002 arctic cat 800 carb this weekend. And I noticed that it seems to of had a bit of a bog. So I lifted the track and was messing with it and it seemed fine till about 8000 Rpms but then it wouldn't go above. So is this a clutching issue or is it because of the valves or what?
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Old 10-18-2011, 01:52 PM   #2
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Sled: 2004 975cc 1M, '04 1462cc 1M
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The Cat 800 from '01-'04 should turn ~74-7600 RPM wide open, unless it's got an aftermarket exhaust.
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Old 10-18-2011, 03:20 PM   #3
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Like IDCATMAN3 said, top RPM in stock form is about 7500 rpm. How were you detecting the bog?? What is the temperature and how is it jetted?? What mods does it have?? Are the valves opening?? You can check the valves by removing the cover on the servo and watching to see if the servo moves. It should cycle at startup and also open around 6900 rpm if I remember right.
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Old 10-19-2011, 10:55 AM   #4
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109jb, you're right, on the carb motors, the valves should cycle once on startup. If they cycle three times, it means there is a problem and they will not open.

However, if it's revving to nearly 8k, I'd bet the valves are opening. Whenever I've been around one with stuck valves, it didn't want to rev at all past ~7k.
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Old 10-19-2011, 11:39 AM   #5
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Yep. Agreed. I was just thinking they may be sticking ot opening late for some reason and when they finally do pop open the engine comes to life. This could make it feel lile a bog.

Also, jetting could be for colder/lower and it could just be pig rich.
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