I just bought a 2016 Teryx 800 / 2. I bought it knowing it needed a stator (wasn't charging battery). I thought it ran fine as long as I had a fully charged battery until I went full throttle on the blacktop. It would only go 38 mph. To make a long story short, I have adjusted the valves, removed the CVT and disassembled, cleaned, inspected, installed a new belt with no improvement. I then tested the fuel pressure and max. was 47-48 and running in hi range 45 psi at 7200-7500 rpm @ 38-39 mph. I am still waiting on the new stator to arrive and it will be installed as soon as it arrives, but I can't see that being the problem. Whether I run with the headlights on or off there is no difference in performance. I'm going to remove the muffler tonight and try that. Anyone that has any ideas please let me know.