Hello everyone I just purchased a 1996 Polaris Sportsman 500. The owner told me ahead of time about a knocking/ticking noise at idle. He said it has been doing that for over 6 years and it didn't seem to worsen. I rode the atv prior to purchase and anything above idle the noise goes away. The atv operates with no problems otherwise but I am interested in getting rid of the noise if I can. The previous owner is a former Polaris mechanic and said that he rebuilt the engine several years ago. He said the engine noise started a few years after the rebuild. He did tell me he replaced the cam since they were an issue as well as all internals. It runs great, no smoke, no backfire, just perfect. Just wondered if anyone heard of this noise in the early sportsman 500. I will also add the previous owner said he had the top end apart several times to try and determine what was causing it. He said he could not find anything, but was suspicious of the decompression. Thank you in advance for any help.