You need to put a new impeller in before you start it you risk plugging the cooling system with chunks of impeller. To see if she pops I allways put some
I have a 20hp mercury outboard think its 1970s pull start long shaft. The engine has been sat up for almost 20 years yet still seams to be
Same as classic 50 and 40 Magnum
I tried pumping the fuel primer bulb and the engine still surged and died when I reduced throttle. I checked the spark and it jumps 7/16" gap.
I checked the spark and it jumps 7/16" gap. The compression is 60 in the top cylinder and 62 in the lower cylinder. I readjusted the carburetor low