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I just bought this sled from a guy for super cheap. It starts and holds an idle, but I can't get it to rev over 4500 rpm's. I've worked on a lot of polaris rmk's but this is my first ski doo. Any ideas on what may be the problem? The guy I got it from said he thought it spun a bearing on the crank, but I'm not so sure. Any help would be greatly appreciated.