Got my new Matryx Patriot 850 and owners manual doesn't mention anything about cleaning the exhaust valves. My wifes Liberty 600 still requires the exhaust valves to be cleaned. Is something different on the new 850 that makes this unnecessary? Manual actually calls out the 650 needing the cleaning at 1,500 miles but only references the 650, nothing on the 850?? Both are VES engines I believe?