Valve floater, From looking at your picture is appears that your muffler is right up against the back of your engine and may be blocking the airflow on the backside of your engine. This could drastically effect the performance of your engine. I would seriously consider, if you have the room, to somehow move the muffler away from the cylinder head. If you have a hot spot on the backside of your cylinder it could distort the sleeve and burn up your engine. At the least it would make it hard to set your carb needles for full range operation. Just my personal observation.

I do not have the new DLE-30 (yet). I was hoping to hear from someone that does.

Speedy