2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 88Get this manual
MAINTENANCE Install the new drive chain over the sprocketO-RINGS (J$SF PLATE
Never reuse the old drive chain, master link, master link plate and O-ringInsert the master Install the new master clink, O-rings and platelink from the inside of the drive chain, and install the plate with the identification mark facing out
MASTER LINK Assemble the part with the drive chain tool setTOOL: Drive chain tool set 07HMH-MR10103 or 07HMH-MR1010C (U.S.Aonly) DRIVE CHAIN TOOL SET