Well nathan as far as what cowl goes on it,it could be a few as these bases and engines where used on about three different models.Here let me show you.
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This one has had somebody change the muffle but the base has the slot for the muffler to go through.Also the handles had been modified,I have put them back the way they should be.This picture was taken before that work was done.Have a look at the engine see what model and year it is. That may help into finding out what it should be.
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Here for a good time,not a long time.