Does this method sound OK?

After setting things up (i.e., retracting tensioner, removing old belt etc.)
a. put the bottom section of the plastic cover back on (no bolts yet)to provide an index of TDC on the plastic cover (at 12 0'clock position on cover
b. put pulley on (no bolts yet) and line up TDC mark on pully with TDC mark on plastic cover
c. vertify that valves are in correct position by lining up mark on cam with mark on plastic cover back plate (also look inside breather cap to see that the lobes are up not down)and also sticking stiff plastic/rubber tube down spark plug hole to verify that piston is at top of cylinder

Sound Ok??

Now two other questions:

- What physical feature on the camshaft sprocket is the double mark on the new belt supposed to line up with?

- Also it seems that the piston is highest in the cylinder when the timing mark is about 12 degrees before top dead center (using the marks on plastic cover while observing the plastic/rubber tube move up and down when moving the crank with the pully. Any one have an explanation for this? Seems that the true top dead center (when piston is at its highest point) would be at 0 degrees where the long mark is located on the case at the 12 o'clock positon?

Thanks for any illumination you can give.

Mike