Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 21Get this manual
BFSOBF5A
4VALVE CLEARANCE
NOTE: Check and adjust the valve clearance when the engine is cold1) Remove the cylinder head cover and align the "T" mark on the flywheel with the "AT" mark on the ignition coilMake sure that the piston is at TDC of the compression stroke 2) Measure the clearance between the valve and the rocker arm by inserting thickness gauge0.06-0.14 mm (0.002-0.006 in) -0.19 mm (0.004-0.007 in)
3) If the valve clearance is not within the specified rangeadjust
by loosening the lock nut while holding the pivotNow turn the pivot4) Hold the pivot and tighten the lock nut5) Recheck the valve clearance
LOCK NUT ROCKER ARM
5FUEL-LINE FILTER
Water or sediment accumulated in the fuel filter can cause loss of power or hard startingTo prevent engine malfunction, replace the fuel filter regularly