I had a problem with my M151A2 that sounds just like the one that you
describe. The only thing that would smooth out the engine was the
application of a little choke.
I worked on this problem for about a year! During that time I tired
everything, and I mean everything (4 different distributers, 4 different sets
of wires, 6 rebuilt carberators, tested fuel pressure, tested compression,
checked valve timing, tested iginiton timing, changed fuel, etc, etc, ect.).
After doing some reading I finally came to the conclusion that the problem
was the new oxiginated fuels that had come out in my area.
These new clean burning oxiginated fuels contain fuel as well as a little
oxidizer and need less air to burn properly. This new mixture works fine
when you have a modern vehicle that has a closed loop carberation / injection
system that looks at the O2 in the exhaust and adjusts the fuel to air ratio.
It does not work well when you have an old carberated / open loop system
that assumes the oxygen demand of the fuel.
For now I fine tune the fuel to air ratio with each fill up, using the choke
lever. This is not a real problem for me because I am a pilot and this is
something that you are constaintly doing with a small airplane and I am used
to it. If you find a better fix, I would be glad to hear what you come up
with.
Good Luck.
Bill
M151A2
M416
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