It don`t look like much, But after all this trial and error over the last year messing with bigger carbs, porting, setting the squish ect..tried useing a catnip cdi and I had been trying to get a stuffed g2 reed and 21mm pwk carb and than a smaller 19mm oko just couldn`t get ittuned right with it. Useing the 40 tooth sprocket i had lost 6mph with the bigger carbs and catnip cdi. I ended up going back to a ztmoto reed and bofang carb and reg, cdi. Now she`s back up there over 40mph rippen it for even more. A couple of thing i`m gonna change is the wheels. I have ordered a Phantom 85 kit (cant wait). The 36 tooth rag joint sprocket that comes with it. I am putting it on a set of black rims and spoke wheels thats going on this ride again. I`ll use the cnc 40 tooth sprocket with the 85 kit. I`m sure the catnip cdi coil and bigger carbs will come back into play later on. But besides mounting the back of the f2 better and a bag on the front to hide cable and carry tools, she almost done.