Hi Fellow: From all that I have read, the answer to this question is simply a personal one. Choose the engine you love, and live with any mechanical, or operational difficulties if any. I prefer the two stroke for its simplicity. As a retired aircraft mechanic, nothing would please me more than toying with the inners of a 4-stroke, but the two strokes give me just enough fun to keep me happy. In dealing with a widow's husbands hobby inventory, there were many new Saito 4 strokes. The 150 Blacknight was a prize to hold physcially, but priced near $400.- it was something to expensive for me to purchase, and then dare to put it into the air.

Xtratorque: Have fun choosing you engine.

AERORICH