Timm

Yes, the exhaust position puzzles me as well. The newer three blade is that hole in front of the prop. The older one has holes in the sides of the exhaust pipe.

The canoe, loaded. In choppy water twisting to mount a heavy outboard is delicate. Seldom have a portage/launch point that allows mounting the motor on dry land.

Just for comparison here are two outboards.
The older one, red, has a two bladed prop and a smaller tank that will run about 30 minutes.
The newer one has a three bladed prop. Haven't been able to get a continuous run on it.
Both move a 15 ft canoe at about 5 mph
 

I have now accumulated enough engines to mix and match for the outboard and chain saw. I have also got a mixed bag of different parts. Does anyone know how to identify the different motors?
 
   a search online came up with this.  
a "Compact 1" engine, 1.25 x 1.032, 1.26 CID, 20.648 CC, rated at 3/4hp
a "Compact 2"   motor 1.25 x 1.096   1.34 CID, 21.959 CC (call it 22 cc) rated at .85 hp
a "Compact 2" also rated at 1 hp but no change in CID.
 
So how do I identify the different motors and is that last one for real? The only way I know to up the HP on an engine w/o increasing the displacement is to increase the RPM or torque which involves the governor and the carburetor. How do I know the difference?
 
The outboard motor moves my canoe at 5 mph and that is fine. But the chainsaw will always need more power so how to get it?
....and a picture just for fun.

Just for comparison here are two outboards.
The older one, red, has a two bladed prop and a smaller tank that will run about 30 minutes.
The newer one has a three bladed prop. Haven't been able to get a continuous run on it.
Both move a 15 ft canoe at about 5 mph