During reassembly of a four-stroke overhead camshaft (OHC) underbone engine, what is the correct procedure for aligning the valve/camshaft timing?

1. Align the 'T' (Top Dead Center) mark on the flywheel with the crankcase index mark, and align the timing mark on the camshaft sprocket with the cylinder head reference index before installing the cam chain.
2. Align the 'F' (Fire) mark on the flywheel with the crankcase pointer, and make sure the camshaft lobes are pointing straight down toward the piston.
3. Align the index mark on the crankshaft sprocket with the piston pin axis, and turn the camshaft sprocket clockwise until the exhaust valve is fully compressed.
4. Align the 'T' mark on the flywheel with the crankcase index mark, and tighten the cam chain tensioner until the camshaft sprocket timing mark rotates 90 degrees past the head index mark.