My 800 ranger is making a knocking/ticking noise. I checked compression which was 150psi each side, checked the pressure relief valve which was free and checked the pushrods which were not bent. Its not clutch noise since a new primary was just installed.
Sounds like a big end is unhappy... But check valve clearances, they aren't adjustable on these, as they use hydraulic lifters, but I've had them fail and the engine gets noisy, but unfortunately that video makes it sound like something more sinister.