Hi

>What do you mean by open exhaust? Did you take the muffler off? In my
experience
>model airplane engines don't run very well without the muffler. I had one
plane
>where the muffler fell off in flight and the engine stopped very quickly.

This is probably due to the change in mixture setting caused by the change
in back pressure when the muffler drops off.
Engines *do* run perfectly well without a muffler, but I would'nt recommend
it for the obvious reason.


>I've also found that they're very hard to start without the muffler too.

Again, that is only true if you try to start at the mixture settings you use
when the muffler is fitted.

It's pretty academic anyway, because I can't think of any practical
situation where anyone would want to use a 2 stroke without a muffler. I
only did it because I'm using an old and useless engine that does not have a
muffler for my tinkering :-)

Alan

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