Start researching, the newer generation 4 strokes have been around since 2000 and all of them can be built up to modern spec and just about any power level or style, torque bottom end tractor, quick revving screamer, +70 HP sidecar engine. YOu cab find the older ones still in good shape for under $3000, or buy a project and build it to what you want.
The bikes are modular so parts fit across many or every model. KTMs are the VW bug of dirt bikes.
ktmtalk.com is the best resource for info or ask me if you have any questions. I've been racing them since my 1996 360SX.
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