I don't remember the model numbers and which engine they indicate, but you can look that up online. The Stihl engines are very high quality. The Stihl 27cc engine is a pretty good engine and an easy conversion, but the 25cc engine is better. It is a bit lighter and has more power. The Stihl 4 Mix four stroke engines are fairly light for a four stroke, and make decent power.

Have fun!

AV8TOR