2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 235Get this manual
CYLINDERPISTON CAM CHAIN TENSIONER LIFTER The lifter shaft should not go into the lifter body when it is pushedWhen the shaft (inside of the body) is turned clockwise with screwdriver, the lifter shaft should be pulled into the lifter bodyThe shaft should spring out of the body as soon as the screwdriver is released
CYLINDER STUD BOLT REPLACEMENT
Thread two nuts onto the stud and tighten them together, and use the wrench on them to turn the stud bolt outInstall new stud bolts in the direction as shownBe sure to verify the stud height from the crankcase surfaceAdjust the height if necessary'04'05: 145.5 mm (rear left side) 149.51 mm (3 places)