I have had a vmax for several years now, brother/dad/friend also have a vmax. We clean them before every year. The small pilot (??) jet has been clogged every year except this one (in mine anyway) for some reason???
Anyways I think it's a must do. Doesn't take long - and if the small pilot jet is plugged I believe that will burn up a cylinder eventually (mine did that once - that's the only thing I could come up with why, I had just bought the thing and the jet was clogged upon investigation).