i put an 86 kx500 motor in a banshee frame.banshee motor was way faster.i had an 86 tri-z...very fun and dangerous.but still slower than banshee.friend built cr500 on alky in atc 250r frame with ftz drag pipe.still slower than banshee.if a lightweight threewheeler was the way to go fast in 300 ft. dirt drags you would see way more of them...very cool bike by the way!!would love to ride it..