I've seen this topic vaguely covered in past threads ,, but to no real awnser , is dropping a tooth or two in upper chaincase gear a good idea with a motor witch already turns almost 11,000 rpm ?? I realize it wouldn't effect the clutch side much , but I would like to try it.... I have an mxz I dropped a tooth size on and gained some low end snap... I realize this is a 4 stroke and already has that , but I'm willing to sacrifice some top speed to gain. A little more bottom end ... A gear is only like $30 , and let's u use more of the tourque the motor is already making with out adding engine more to decrease engine longevity.... Any thoughts on any of this ???