i got a mbx 10 , just put in a black mamba cam & 26 lbs springs in my pred , and its hitting 60 now, but im only 145lbs dripping wet. my pred has flywheel,rod,springs 26lb, blk mamba cam, shotgun header with a rlv silencer, and a 22 mm mikuni slide carb, my clutch is a hillard inferno,arc sidecover, 1st thing i did today before i tested it out is grab my helmet and jacket ,jeans, gloves, because i wrecked this bike once and almost got hurt real bad,safty is a must. with this cam im needing a fuel pump and a different intake manifold because its not getting enough gas.im guessing im only getting around 7000 rpms, as i really dont notice a difference between the 26lb springs and black mamba cam vs 18lb springs and the dynocams 236 cam i have.the 236 is 236in 236ex @.50 duration . maybe even need a new bigger carb . i got 50 acres i ride on and off road everyday , i really want some aluminum rims for front and back.