[b]IE:

The muffler isn't just for noise - most two stroke engines we use with our rudimentary carbs wont idle without the back pressure.

But give it a try if you want, however why would you want to throttle the boost engine on a sail plane? I thought the point was to get it up high and then soar power off. Just limit tne engine run time. Unless you want to keep it low and slow, of course.

Another point - the Norvel 074 is about twice as powerful as your OS 07.

Bill.