everything on it is hand built chassis wise i did it all....built frame wheelie bar steering stem/handle bars shifter brake pedal.......it started off as a honda 250r but only thing stock is the cases....it has a billet transmisson due to gears busting with the hp it makes, stock stroke aftermarket crank, aftermarket cylinder[now 399cc istead of 250] stock they came with around a 28mm carb this one has a 52mm it runs on alky, hand built drag pipe.....this motor made 92 rwh on the dyno and almost forogt to add it has a 30 shot of nos on top of everythign