3-36 ENGINE • After installing the valve guides, re-finish their guiding bores using the reamer. • Clean and oil the guides after reaming. 09916-33210: Valve guide reamer 09916-34542: Reamer handle NOTE: * Be sure to cool down the cylinder head to ambient air temper- ature. * Insert the reamer from the combustion chamber and always turn the reamer handle clockwise. VALVE SEAT WIDTH INSPECTION • Visually check for valve seat width on each valve face. • If the valve face has worn abnormally, replace the valve. • Coat the valve seat with Prussian Blue and set the valve in place. Rotate the valve with light pressure. • Check that the transferred blue on the valve face is uniform all around and in center of the valve face. 09916-10911: Valve lapper set E • If the seat width W measured exceeds the standard value or L seat width is not uniform, reface the seat using the seat cutter. Valve seat width W: P Standard: 0.9 – 1.1 mm (0.035 – 0.043 in) M If the valve seat is out of specification, re-cut the seat. A S