I have a 2006 Birel chassis with a Honda CR85 6 speed engine in it. The engine is ported, has duel reed cage, bigger modified carb, pump around fuel system, heavy duty 3rd gear, RLV pipe and silencer just repacked, engine was rebuilt just 3 hours ago. The engine package alone cost well over $2000. The chassis was just gone though, it is straight and has no cracks. 50mm axle, 32mm frame, bottom of the frame is hardly scratched, new chain and sprockets. Tillet ML seat, Bridgestone tires (I also have spare tires). If you have any questions feel free to contact me.