i have a full out race bike it is a 2000 yz 80 big wheel this thing kicks ass i am 5 10 and 180 lb and the front tire comes up every gear i put alot of money into this bike and so did the owner before me i put a fmf head pipe on it so it has a full fmf exhaust and i put a new twin airfilter in it and a new rear tire the engine has alot of work done to it but i dont have a list of what is done but when u start it up you can tell it has alot of work done to it this is one fast bike tops out around 70 runs with yz 125 i have a video on you tube just type in race bike run here are some pic too