I have a few CFmoto 4x4's and I love them. I have a 2020 CForce 800 with 475 miles on it and I have changed the oil and filter 3 times so far ( I know it is overkill ). The major issue that just developed is there is lots of noise coming from the engine. Sounds to me like a chain rattle or loud ticking. My dealer adjusted the valves and they were not even out of spec and the oil is full and clean. Everything seems to be as it should be. It is really loud and they agree it is and they have no idea why it started or what it is. Exhaust leak? Any info would be appreciated. Thanks for reading this. Jim in Vermont

[2015 Z Force 800 53/Trail EPS]

Check the cam chains and tensioners. Some have had them fail. Don't keep running it if you feel it is internal.