2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 87Get this manual
MAINTENANCE REPLACEMENT This motorcycle uses drive chain with staked master linkLoosen the drive chain (page 4-22)When using the Assemble the special tool as shownspecial tool, follow the manufacturer's TOOL:
DRIVE CHAIN TOOL SET:
instruction Drive chain tool set
07HMH-MR10103 or 07HMH-MR1010C (U.S.Aonly)
Locate the crimped pin ends of the master link from the outside of the chain and remove the link with the drive chain tool setRemove the drive chain