We have two AX8/9 that we have run Clone, World Formula and LO206 on. Because of Arrow’s double leg seat mounts there was interference when mounting the four-strokes. I removed the stock mounts being careful to not cut or grind into the chassis tubing. Spot painted the chassis with Yamaha motorcycle touch-up paint and installed an aftermarket seat strut from the rear cross member to the seat. They work fine. I will say we run 219 gear as that is what the WF comes with and we have not had any gear clearance issues.