I sold my Brison 3.2 to a RCU member. It's a stump-puller. He mounted it in his plane and tested the thrust with a digital scale. The 3.2 pulled 26 lbs. 8 ounces. The engine is on it's 4th or 5th gallon. It has a Bisson pitts with the tips cut off. Kinda wish I had it yet. I broke it in on Stihl chainsaw oil and switched to Amzoil 80-1.