2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 140Get this manual
CYLINDER HEADVALVECAMSHAFT Measure each follower 1.0SERVICE LIMIT: 22.54 mm (0.887 in) Subtract each follower 0.0from the corresponding bore 1.0to obtain the follower-to -bore clearanceSERVICE LIMIT: 0.07 mm (0.003 in)
CAM CHAIN TENSIONER ARM Check the slipper surface of the tensioner arm for wear or damage
CAM CHAIN TENSIONER LIFTER Check the lifter operation as followsThe tensioner shaft should not go into the body when it is pushedWhen the stopper block is pressed in, the tensioner shaft should be pushed into the body The shaft spring out of the body when the stopper block is released