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  Model AO (Styled)
Point Gap .021
Plug Gap .030
Timing Mark On Flywheel
Spark Occurs  
Firing Order 1-2
Intake Valve Clearance .020 Hot
Exhaust Valve Clearance .020 Hot
Comments For magneto set point gap to .015 - Spark occurs when dot or "LH-Impulse" aligns with index on cover or case.

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Serial Numbers
1937 AO-1000 1938 AO-1539 1939 AO-1725
1940 AO-1801        
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