My arctic cat 650 h1 started misfiring and hard to start, after checking and finding a bad hose and cleaning out the carb the atv starts anf runs in high gear like new. Now if you put it in low or reverse it will misfire and pop like it did before I fixed the hose. I am stumped at this one, anyone ever run into this problem before I sure would be grateful for the help..

 

When is the last time the carb was puled apart and cleaned? Have you checked the plug? Also when is the last time the valves were adjusted?