Bit of a book here, but it was entertaining.
This problem has solved itself but I thought I would throw it out for you people to ponder over. Apparently Evinrude apparently makes 40 hp diesel outboards since recently while I was fixing a customers '95 40 hp 2 cyl outboard (tried to suck a mouse nest in the idle ports and the carbs had to come off to be cleaned) I got it working great and was revving the motor up and down, (A little higher than I should have) it suddenly stuck at 5000 rpms, thinking I had left a piece of carb linkage out of place and it had jammed I quickly went back to the motor to find that it looked normal. At this point I was concerned for the engines health since running wide open without a load at high rpms on a hose isnt good. So I went and turned the key off and not only did it not stop it, it actually gained 100 rpms and started sounding a little askew. Thinking I had a shorted key I went and pulled the safety lanyard. Nope, no good there either. I ran back the motor still wildly spinning out of control and finally just yanked both spark plug wires off of it. Umm, nope that didn't stop it either. So I just stared at the engine happily running at 5000 rpms without a miss with both of its spark plugs clearly disconnected from the wires and scratched my head. I tried putting it in gear like that and it banged into forward and started spinning the prop without slowing at all. I probably shoulda tried drowning it with the primer solenoid but I was afraid that it would spin faster, so instead I managed to cover all the spaced out holes on the airbox and got it to choke itself to death. I eventually started it up again and got it to do that once more before it finally quit doing it and it didn't come back but I was a little reluctant to give it back to the customer that way. Apparently its done with those antics though.
Near as I can figure something in the mouse nest which was mostly foam rubber and bits of other stuff from the pontoon it was on must have gotten sucked in and cooked to carbon that glowed hot enough in both cylinders to somehow allow that to happen. The odds of that happening to both cylinders at the same time (was definetely running on both) are ridiculous but thats the best I have at this point.
Either that or it was posessed by a demon that got bored and left after some mischief. :devil:
Take your pick.
This problem has solved itself but I thought I would throw it out for you people to ponder over. Apparently Evinrude apparently makes 40 hp diesel outboards since recently while I was fixing a customers '95 40 hp 2 cyl outboard (tried to suck a mouse nest in the idle ports and the carbs had to come off to be cleaned) I got it working great and was revving the motor up and down, (A little higher than I should have) it suddenly stuck at 5000 rpms, thinking I had left a piece of carb linkage out of place and it had jammed I quickly went back to the motor to find that it looked normal. At this point I was concerned for the engines health since running wide open without a load at high rpms on a hose isnt good. So I went and turned the key off and not only did it not stop it, it actually gained 100 rpms and started sounding a little askew. Thinking I had a shorted key I went and pulled the safety lanyard. Nope, no good there either. I ran back the motor still wildly spinning out of control and finally just yanked both spark plug wires off of it. Umm, nope that didn't stop it either. So I just stared at the engine happily running at 5000 rpms without a miss with both of its spark plugs clearly disconnected from the wires and scratched my head. I tried putting it in gear like that and it banged into forward and started spinning the prop without slowing at all. I probably shoulda tried drowning it with the primer solenoid but I was afraid that it would spin faster, so instead I managed to cover all the spaced out holes on the airbox and got it to choke itself to death. I eventually started it up again and got it to do that once more before it finally quit doing it and it didn't come back but I was a little reluctant to give it back to the customer that way. Apparently its done with those antics though.
Near as I can figure something in the mouse nest which was mostly foam rubber and bits of other stuff from the pontoon it was on must have gotten sucked in and cooked to carbon that glowed hot enough in both cylinders to somehow allow that to happen. The odds of that happening to both cylinders at the same time (was definetely running on both) are ridiculous but thats the best I have at this point.
Either that or it was posessed by a demon that got bored and left after some mischief. :devil:
Take your pick.
