Who would win in a 100yd drag? The yfz has curtis sparks exhaust with the big core kit, jet kit, k&n and nerf bars. The 250r has fmf pipe, jets, uni filter. Also how much horsepower should the yfz450 have with the mods listed above? How much do they have stock? And what length of race does the 450 have a better chance of winning?

 

stock yfz around 33-35 hp, stock 250r from 30-33 hp, with those mods yfz putting out around 40 or so. 250r about 38ish, the yfz has a better power to weight ratio stock, so my bet would be on the yfz

 

I would say you would win in 100 yards because you have the nerfbars mod,

 

actualy,the 250r as a better power to weight ratio. Its going to be a close race tho.
goodluck!

 

I just raced my buddies 86 250R atc, with fmf pipe. It was an impressive machine for its time and could be built to put out some great power, but it just cant keep up with today's machines. probably still one of the best track bikes though!