2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 80Get this manual
MAINTENANCE Remove the two bolts and oil filter cover
Remove the oil filter and spring
OIL FILTER Apply engine oil to the drain bolt threadsInstall the engine oil drain bolt with new sealing washer and tighten it'04'05: TORQUE: 22 (2.2 kgf-m, 16 Ibfft) After '05: TORQUE: 25 N-m (2.5 kgf m, 18 Ibfft) SEALING WASHER