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It has been a while since I popped in here and in the search for more power and some research I have fitted the tope end from a TZR250 2XT model. The 2XT has plated bores instead of steel liners so are lighter and they have auxiliary exhaust ports and wider power valves fr more power so over the last week I have been busy prepping the 2XT top end ready to fit on my engine, which I completed yesterday. I have been out on it today in the one dry spell we had and gave it a good runabout an checking the plugs which looked happy and the bike felt happy too, went into the fun zone a few times and what a difference the 2xt top end has made. It has gone from a mad hooligan bike into a bonkers hooligan in the fun zone. It will be off to the dyno very soon for final set up and the all important back wheel power output readings.