Look up AV10 crate nightmare on MA. These motors are ok, but you have to go through the entire thing. Case match,loctite,etc. Its Chinese. Polini intake because the one it comes with hits pedals. French racing motor mounts. My motor vibrated like crazy when I got it. Piston was backwards, variator imbalanced. Comes with .4mm reeds. Cdi box has no curve. Timing with woodruff key is like 2.0mm set it to 1.2 for a kit. Hit 30mph with an av7 blunderbluss. Start clutch springs SUCK. Hit 48 with the airsal with an av7 head.