I have a Honda HS522 the wheel model The engine runs like a Honda But the transmission is all over the place. The adjustments seem to be perfect looks like a unit was used very little. When I place it in neutral it moves forward then when I place it in 1 sometimes it move forward and at other times it does not. When placing it in gears at times there is a clunk comming from the transmission. I do not see any fill plugs for the transmission I am assuming it's filled with fluid. All I can say Honda takes something simple and complicates the hell out of it. Any thoughts. Thanks