83/4 kx 250 cylinder, kx ignition, 83-87 i think work, get a better pipe, go with a bigger carb and k&n filter, you got a rocket. get yourself a +2 swinger to help keep the front down, some wheelspacers to widen it since not alot of extended axles are out there, maybe some progressive springs in the forks, and a better shock out back like a 300ex, which is ok. but id rather have something adjustable like a raptor shock.
1985 KXT 250 Tecate - kx cylinder, kx ignition, bassani headpipe, answer silencer, v-force reeds, 38mm airstyker carb, +2 franks swinger, raptor rear shock.
1996 YSF240 Blaster - maxxed out!!!
Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "HOLY SH-T, what a ride!"