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I want to build a full suspension motorized bike out of a free mongoose xr200 frame for as cheap as possible and slowly upgrade to better parts later. The starting point is with the frame. I can MIG weld steel and aluminum, notch tubing etc.. I was hoping with 2 other donor frames, to extend the rear swing arm a bit and relocate the shock from inside the frame to the rear of the bike similar to a motoped rear suspension set up to make room inside the frame for the 2 stroke engine and also so the bikes my size better.. I'm hoping I can do it without a jig and won't be wasting my time..