Easy to make the lowering blocks for internal drop (the better route). The XJ series is the inline 4's. The XS was the 2 and 3 cylinders and had a few 4's but not many. Many of the XJ parts will swap with other XJ's so you could probably source a radian 600 and swap the engine out and get more power. OR, find a seca turbo donor bike and swap the turbo parts over and get a LOT more power. Should be a fairly simple swap and I can probably help you with it.
Sean
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