Mercury Mark 55-E timing marks

[sbrown21]

I have a 1957 mark 55-E outboard. The question I have is this there are two timing marks on the flywheel one is a 0 with a line under it .The other is just a line the one with just a line is top dead center on # 1 piston. , the one with the o is about .250 before top dead center. What line do I use to time the engine by the belt to the arrow on the mag . I have looked at the book and can’t figure witch line to use.
Thanx

[dave-bernard]

top dead center and arrow.

[sbrown21]

Thank you very much I don’t much about the bigger motors I have always worked on 10 hp. and smaller with out electric start. I hope I get a spark the timing belt was broke when I bought it on a 1957 yellow Jacket wood boat.

[dave-bernard]

if no spark call me.
1 914 310 7086

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