I have the stealth 135. I ran it on a long trip this past weekend and had no problems on even hard pulls. I took a buddy for a ride tonight and hammered it pretty good into 3rd... tires spinning.. and hit 1600+ on the pyro. I didn't notice at first as I was trying to keep it on the road, but my rider saw it a told me to get off of it quick. It didn't come off ther pin for a couple seconds. I quess the Quad is not so cool running after all. Did I trash my rig?? All I need is a blown head gasket at 3500 miles.