The things that happen with this ecu are the following,its completely adjustable ecu that with the proper cable can fit on any bike this is good and bad because the stock values for the xt660 are unknown and you have to set every sensor-advance-injection iap-fuel,the ecu tends to run rich and it needs lot of air(stage 2 without filter inside and drilled holes is not enough),i have some start up problems especially when cold and i dont know how to set it correctly and i have tried lots of setups(something with the sensors is here).As for the camshaft i have tried with a hotcam of unknown specs because it was custom made(i have fotos of it if you can understand who it is) the bike was pulling hard until 7800rpm but the valves were doing like crazy and the bike was shaking so i removed the camshaft and i made an xt660 cam with a wilder profile the bike was dropping at 7100 rpm but valves were not having noticable problems.I have made a custom map and the bike runs smooth but there is lot of space for improvement

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XT660X STOCK