2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 85Get this manual
FUEL SYSTEM Disconnect the PAIR control valve vacuum hose and remove the PAIR control valve
Connect the PAIR control valve vacuum hose to the PAIR control valve
Connect the air supply pipe-to-PAIR control valve hose to the PAIR control valveSet the PAIR control valve and tighten the PAIR control valve mounting boltsConnect the air cleaner sub filter-to-PAIA control valve hoseInstall the seat (page 2-3)