Got to working on my sled tonight and cleaned my power valves and also installed a tether switch.2011 Assault RMK with 1050 miles. Only have used VES Gold oil. I was really surprised to see how clean the PV's were. Very minimal carbon build up.I landed up just taking the hood right off(very easy to do). Pulled the pipe for ease of access. Only hiccup was the PTO side PV, the steering post makes it a little tight, but not a big deal.