2009 Yamaha F40 Outboard Service Manual, Page 222Get this manual
Camshaft and valve Camshaft journal diameter #1 c: 36.92536.945 mm (1.45371.4545 in) Camshaft journal diameter #2 d, #3 e: 36.93536.955 mm (1.45411.4549 in) Cylinder head journal inside diameter f: 37.00037.025 mm (1.45671.4577 in)
Assembling the cylinder head
1Install new valve seal onto the valve guide b
Checking the spark plug
1Clean the electrodes with spark plug cleaner2Install the valve c, the valve spring seat d, the valve spring e, and the valve spring retainer in this order, and then attach the special service tools and h