2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 84Get this manual
FUEL SYSTEM Check the valve reed for fatigue or damage, replace if necessaryReplace the PAIR control valve if the seat rubber is cracked, deteriorated or damaged, or if there is clearance between the reed and seatSEAT RUBBER
,REED Install the PAIR check valve
PAIR CHECK VALVE Install the PAIR check valve cover and tighten the screwsInstall the PAIR control valve (page 5-20) SCREWS