Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 46Get this manual
BFBOBF5A
4) Remove the new valve guides from the refrigerator one at time as needed5) Install the new valve guides from the valve spring side of the cylinder headDrive each valve guide to the specified height (measured from the top of the valve guide to the cylinder casting as shown)6) After installation, inspect the valve guide for damageReplace the guide if damagedISPECIFIED HEIGHT (IN EX
1.0 mm (0.04 in)
VALVE GUIDE REAMING
NOTE: For best results, be sure the cylinder head is at room temperature before reaming valve guidesVALVE GUIDE REAMER
1) Coat the reamer and valve guide with cutting oil2) Rotate the reamer clockwise throught the valve guide the
No.07984-200000A
full length of the reamerContinue to rotate the reamer clockwise while removing it from the valve guideThoroughly clean the cylinder head to remove any cutting residueCheck the valve guide bore; it should be straight, round and centered in the valve guideInsert the valve and check operation If the valve does not operate smoothly, the guide may have been bent during installationReplace the valve guide if it is bent 'or damaged' Check the Valve Guide-to-Stem Clearance(P.43)