2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 44Get this manual
MAINTENANCE OIL CHANGE NOTE: Change the engine oil with the engine warm to assure complete and rapid draining
Start the engine and let it idle for few inutesStop the engineRemove the oil filler capdipstick from the right crankcase cover
Remove the oil drain bolt and sea ling washer, and drain the engine oilAfter the oil has drained, install the drain bolt with new sealing washer and tighten itTORQUE: 24 (2.4 kgfm 17 Ibf.ft)
NOTE: If the oil stra iner cleaning is requiredperform it before filling (page 3-12)