Having just replaced a 20 hp single with a BS twin 20 I can assure you the single is a bad design. One problem is getting 20 hp in one bang every other rotation. Vibration is horrific to the point where a lot of bolts to key areas just can't stay in place.
Next they decided to invert the crankcase and put the lid on top. In doing so, they failed to add adequate reinforcing in the casting and not only did the top cover to the crankcase vibrate loose repeatedly, the crankcase developed a 2" crack from the cover and going down the block vertically.
All with 380 hours.
The BS twin is smooth as silk like my 22 BS twin.
I have a 15, 16, and 17.5 Kohler Commander and all are twice or more as old as the Courage, all singles and have had zero problems with them.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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