The throttle will not return to full idle.

If by now you have used this unit for two seasons, you will have to replace a muffler.

Two cycle engines will produce more afterburn and will eventually clogged the muffler. Result, an engine that will not idle. In my case the fix was an easy one. I drilled a couple of holes in the muffler. It is not a warranted repair. But it did work for me. Thanks for asking. Matt of Martins TV Repair.