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Set your cam at tdc where the valves are loose. That way you know it is tdc by looking at the mark on the cam sprocket and the clearance of the valves. I then made a mark on the coil and on the weight in line w/ each other. This way I know that whenever the cam mark and weight mark line up I am at tdc.

If you don't understand I will try to explain it differently.

It's easier to do if you set your engine at tdc b/4 you take the original flywheel off. Break the flywheel loose then set it at tdc and pull it off. When you slide your new weight on it will already be at tdc.
 
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