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Older Mercury missing at full trottle

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birdhouse391

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I have a 83 2 cylinder 40 hp M

I have a 83 2 cylinder 40 hp Mercury outboard that has developed a intermittent miss on plane at full throttle. I have replaced the plugs and change fuel tanks and replaced fuel lines it seems to not have any effect. It seems more like a firing issue can anyone help?
 
Put a timing light on it and o

Put a timing light on it and observe the " steadyness of the spark " as you speed up the motor. Check both cylinders.
 
if it seems like your hit somt

if it seems like your hit somthing in the water like i little jerk in your motor your gear might be slipping on your cluch dog.
 
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