For those of you who have done your valves. I was helping a Pflect do his valves the other night when I noticed something with the instructions. It said line the middle of the "I" mark up with the tick on the hole. Then in the picture it shows a line and not an "I". In the hole you see an "I" go by and then the line. So which one are yall using the line (like the picture shows) or the "I" like the text states?

 

The best way is to turn the engine over until the valves (intake or exh.) are fully open (peak point). Then, turn the engine (crank) over one full revolution (360). This will put the cam at opposite to full open position. Set the clearance. Do the same for other (intake or exhaust valves.

Usually, the I mark is TDC and II mark is ignition fire mark.

 

Just to clarify, I can find TDC. On a Honda (got to love this) there is a "T" mark that you cant miss. There are also other marks like an "F" but there is no doubt the "T" is TDC. On this 660 there is the "I" and the dash all within less than one inch from each other and both real close to TDC. So close I cant tell which one to use.