i bought a '02 polaris pro x fan with 22 miles. ran great in the shop. first time I took it out, it ran great until it got hot, then it had nothing. it would start but would never get over about 2500 rpm's and had no chance of moving. went through the carbs three times, and still, about two minutes of riding, and then nothing. is there something wrong with the cdi, or any other ideas out there?