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Hello. My name is Tan.
Does the engine back fire at any particular rpm? When the engine backfires does squeezing the primer bulb make the back fire quit or pushing in on the choke?
Ok we need to check for top dead center. Remove the # ***** spark plug and turn the flywheel till the # ***** piston is at top dead center. Once you have done that check the timing pointer and the mark on the flywheel. Does the pointer line up with zero or TDC on the flywheel? I use a pencil sticking in the spark plug hole and turn the flywheel till piston is to the highest point. The # ***** cylinder is the top right stbd side of engine.
Is the engine doing this in the water or just on a flushing attachment?