Anything is possible on a mud bike! Sometimes thinking can be your worse enemy too... 
Its rarely productive to make unfounded assumptions, so... does it pass the compression tests, wet & dry? Is the exhaust system clear? Piston not installed backwards? Valves straight and true with good match & seal to valve seats? etc. I've seen a lot of bad cams/lifters over the years, so I can verify as fact that when lobes wear flat, you'll see standoff above the intake.
You can easily measure the valve lift (at the valves) using a dial indicator. Add a degree wheel and you can verify TDC location (check for a bent connecting rod) and whether each cam lobe is good/bad, and verify valve opening & closing event timings, along with lobe center and lobe separation angle.
Its rarely productive to make unfounded assumptions, so... does it pass the compression tests, wet & dry? Is the exhaust system clear? Piston not installed backwards? Valves straight and true with good match & seal to valve seats? etc. I've seen a lot of bad cams/lifters over the years, so I can verify as fact that when lobes wear flat, you'll see standoff above the intake.
You can easily measure the valve lift (at the valves) using a dial indicator. Add a degree wheel and you can verify TDC location (check for a bent connecting rod) and whether each cam lobe is good/bad, and verify valve opening & closing event timings, along with lobe center and lobe separation angle.
