2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 283Get this manual
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CRANKCASEfTRANSMISSIONfCRANKSHAFTBALANCER OIL STRAINER CLEANING Remove the oil strainer and strainer plateWash the strainer thoroughly in non-fiammable or high flash point solvent until all accumulate