I agree that it is strange. All that I can add it that it did exhibit the stalling/bogging that you described, most frequently at start up. Anyway, the jet was eroded as I noted, the engine ran fine with new jets and any future problems belong to the engine's new owner.
My mechanic and I wish we knew the answer to that one. Had we even suspected a carburetor jet issue I would have saved a lot of mechanic time and my money on fixing it. Since the hole in the jet was also angled to one side, my only conclusion is that the main jet casting had a bubble in it that...
Thanks to everyone for your suggestions. The problem has finally been solved by replacing the carburetor jets. It turns out that the main jet was heavily eroded to at least one size bigger than it should have been. After replacing the jets the engine runs fine. Nobody thought to check them...
We looked at the reed valves yesterday and they are intact. The only odd thing is that both cylinders are firing at the same time about every second or third firing cycle. Since the exciter coil has not been replaced I have one on order. Also, the lower crankshaft seal may have been leaking as...
He cleaned and re-built the carb with the carb rebuild kit, as well as cleaning & etc. the fuel pump, and says that it is working correctly now. He is currently thinking that there might one, or both, of the inlet manifold gaskets may be leaking.
The mechanic said he has, but I will double check. He has changed out all of the electrical end (plugs, coil & etc.) except for magneto with no change. The engine starts, quits when it is in idle for longer than 10 seconds or so and won't develop full power at full throttle. The upper cylinder...
My 5 year old M15D2 is getting too much fuel in the lower cylinder which is causing the spark plug to foul, low power and problems at idle. My mechanic has overhauled the carburetor and fuel pump but this has not corrected the issue. While we are scratching our heads over this issue any advice...
