1957 sea horse

[Boaterbuzz]

I have a 1957 10 horse Johnson . Motor starts good idles good then all of a sudden it starts bucking , almost like your pulling spark plug on and off . Please help not sure if this it electrical or fuel problem. Motor has been tuned up two years ago

[Solarman]

Older motors may have to have more frequent tune ups due to the fact that points and condensers were used in those motors.

Good luck.