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Popping like that, especially as you increase the throttle is a sign of a lean condition. Adjusting the rich/lean knob to the rich side may correct it but have you cleaned the carb out? Is the fuel tank on the engine or use a remote tank with a hose?
 
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Have not cleaned out the carb yet as this is the first time I've taken it out therefor noticing the problem. Runs fine out of the water but once it's in and has to push the boat it's different. Don't know much about motors at all but what I've read is the motor/carb on that is roughly the same as a chainsaw/weedwhacker motor(obviously bigger though) and that they're easy to clean out. But I don't even know how to clean it out. And the gas tank is directly on the motor.
One thing I would do then is make sure the vent in the gas cap is clear and working, also disconnect the fuel line at the carb and make sure you've got fuel/gas flow to the carb. Some of those old timers had a petcock/fuel shut off at the tank that will have a wire screen filter on it inside the tank, those can get plugged up pretty easy and cause a restriction or even loss of fuel from the tank. I'd also recommend going over all the bolts and screws and make sure they're tight, you dont have to go hawg wild, just snug them up as over time the paper gaskets will shrink that could cause a vacuum leak that will result in a lean condition.
 
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