A 4 cylinder. If you had to use the primer bulb to keep it running that usually means a bad/weak fuel pump. However, it could also be air leaking into the line, likely at the fuel connector on the engine.
Myself I never cared for the looper 4 cylinder 100, 115, 125 hp engines, so I never paid them much attention as I prefer their predecessor the inline 6s. I do know they are not very tolerate of over revving.