2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 206Get this manual
CYLINDER HEADVALVE Be careful not to damage the valve lifter bore
shims valve lifters
NOTE: The shims can be easily removed with tweezers or magnet Mark each valve lifter and shim to ensure correct reassembly in their original locations Do not forcibly remove the dowel pins from the camshaft holder