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Hi George, We have tested this cam and piston kit for a while now, and wow.. What a great simple upgrade! It completely change the sound of a std Xsport, from raspy to roaring! After a lil running in and double checking the valve clearances we opened it up, well to be honest in comparison to some 131's and Honda we have ridden, i would say a comfy 2Hp increase over std.. Torque is available from lower rev range, the bike now wheelies through the gears up to 3rd. The cam isnt as aggresive as say a Z40 and looks similar profile to a std XSport cam but took alot of adjustment of the tappets to fit, due to the AHP cam being narrow bodied. The piston is a great bit of kit, fits the bore so very well and looks great quality. To be honest i think you could sell loads of these pistons and have lots of very satisfied customers.. If you like i will write a more technical review for the minitrax.co.uk forum Dave/FruitPastile Eco Bike
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