duz anyone here own or know about the 1991 zx6 that came with 599cc engine (dont know the engine code). i think its sposed to have 98hp. anyways, i wanted to adjust the valves but when i took everything apart till i saw the camshafts, this is what i saw: The cams sit directly over top of cylinder shaped pushrods/lifters(?) about 2cm in diameter that are pressed on by the cam lobes. these lifters then press on the valve somewhere where the eye cant see. there r no rocker arms or adjustment screws anywhere. my question is, are these cylinder shaped things hydraulic lifters? if so, how long do they last? can the be adjusted? if they are not.... how do i adjust my valves? i realize i should buy the fsm and I will do that in the near future, but for now any input would be apreciated.