You are right, the ExTech engines are great! I have never had one flame out with mine, excellent power, and great fuel mileage.

I found that the 086 was the best in buggy and 053 was good in truggy. The 086 was smooth with great power from bottom to top. the 053 was a monster on the bottom so it was perfect in the truggy.
The 2013 is also a monster on the bottom.