Reply To: Johnson AB 25 Help

[Tom]

Happy Fourth of July to you too!

OK, taking a long shot here… When you said the motor fired after adding fuel directly to the cylinders, did it just pop once? Or did it fire several times? Also, did you take the crankcase apart?

The reason I ask is this If the motor was disassembled to the point where the top half of the crankcase was removed, and the rod/piston assembly was taken out, it’s possible that the motor was assembled incorrectly. (Or you simply got it that way.) On motors with offset rods and parallel cylinders, it’s possible to assemble the motor such that spark occurs with the pistons at the bottom of the stroke instead of the top of the stroke. You can check this without taking the powerhead apart. With the rope plate removed, facing the front of the motor as if you were going to start it, rotate the flywheel until the keyway is pointing to the cylinder on your right. Then remove either spark plug and confirm that piston is at the top of its stroke. If it’s not, we can guide you through what to do next.

Tom