cr125 questions

just picked up a 93 cr125 a few weeks ago I paid $450 bucks for it runs and rips only thing is back fender is cracked and front brakes need bled.... aint shit my question is i'm looking at going .40 over with the jug fmf fatty with the shorty silencer pod air filter and some carb work a friend of mine was saying about flywheel weights....... where would I find a performance flywheel weight and does it make enough of a difference for me to tear it down to do so..... also I cant seem to find any sort of "stroker" crank for this motor is there a way to Frankenstein crank/connecting rod/ jug/ head combo's for performance gains and if not do the hot rods oem replacements have any sufficient performance gains thankssssssss

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