2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 34Get this manual
3MAINTENANCE
SERVICE INFORMATION 3-2 MAINTENANCE SCHEDULE 3-3 FUEL LINE 3-4 THROTTLE OPERATION 3-4 AIR CLEANER 3-5 SPARK PLUG 3-7 VALVE CLEARANCE 3-8 ENGINE OIL 3-10 ENGINE OIL STRAINER SCREEN 3-1 ENGINE OIL CENTRIFUGAL FILTER 3-12 ENGINE IDLE SPEED 3-13 SECONDARY AIR SUPPLY SYSTEM (U .S.Atype only) 3-13