2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 48Get this manual
MAINTENANCE Inspect the drive chain for possible damage or wearReplace any chain that has damaged rollers, loose fitting links, or otherwise appears unserviceableInstalling new chain on badly worn sprockets will cause the new chain to wear quicklyInspect and replace sprocket as necessary (page 3-15)
LUBRICATION
Lubricate the drive chain with Pro Honda Chain Lube or equivalent chain lubricant designed specifically for use on O-ring chainsSome commercially available chain lubricant may contain solvents which could damage the O-ringsWipe off the excess chain lube