i won againts a crf80f 4 stroke, well kinda, its probaly 2000 and up, i was running 15 or 14 front and 41 back, bet it from the start to the finnish about 2 bikes in lenght but it bet me in full throtle, the kid was probaly 40 kg, somewhere around there, i also draged against a 9 something kx 60, 2 sroke water cooled, wrecked it big time, his engine was probaly stuff cus it stuffed up a few hours later, the inside of the head was worn out bad, piston rings to, and his crank shaft bearings is stuffed, its probaly because his bike was nearly stuffed lolz, the kid is probaly around 40 kgs, also wrecked a 125 ttr e07 or 08 model, 4 stroke, bet it from the start to full trothle but it creaped up and bet me, the rider is probaly 70 to 80 kgs,