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Just a suggestion, if you have 400 to throw at a 140 second hand, why dont you add another 60 odd bucks and buy a brqd new gpx 125 from dhz. They run a hi comp piston, have a strong bottom end, a oil cooler and a light weight outer rotor kit stock. It will definitely hang with 150s, and make a meal of most 140s stock, with some port work on the head it would more than likely destroy a stock 160 as the 150 and 160s dont like to rev past 9 to 10k, stock gpx has a 130000 rpm redline
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