I have a 2011 Arctic Cat 450 TRV. While about 30 miles into my run, I noticed a loud clicking noise coming from the engine/transmission area. I finished the run (about 10 more miles) with that annoying noise. It ran as normal (no change in power or speed) except for the noise. The next day, I pulled the rocker covers to check the valve lash. It checked out OK. When I was turning over the engine manually, I noticed that at a certain point of each revolution, there was a sharp and loud click noise. Any ideas would be greatly appreciated. Thank you in advance.