1.  Royal Speedmaster Almost exactly the same as the IMP motors except for the cowl color and the K&O decal on the rear of the cowl.  Not too easy to find but not that rare either.  

2.  Hurricane  A very common motor and easy to find.  Often found on the Fleetline wooden boat "Thunderbolt"

3.  Cyclone 28 HP  Best looking of the generic motors from K&O.  Almost exactly the same as the 1958 Scott-Atwater 22 HP except that the blue color is much darker on the Cyclone and the Cyclone doesn't have a tiller handle or the lifting handle on top of the cowl.

4.  Sea Dart (blue)  A very small motor and pretty easy to find along with the red one below.  Poorly made of tin and often you will find these damaged.

5.  Sea Dart (red)  Again, a small motor and poorly constructed. Often packaged with a small Fleetline boat.

6.  Tornado (early version)  This motor was also made with the Tornado decal on it, which I don't have.  Poorly constructed of tin, rarely run, and not hard to find.  Often found in pieces.

7.  Tornado (later version)  A much nicer version of the Tornado.  Small motor but kind of neat looking because of the slanted decal on the side.  I've also seen this motor in a light blue version.  Not rare but harder to find then the one above.

8.  Tornado [later version) in light blue with the original box.  This one is the hardest of the three Tornado motors to find.

9.  Early K&O Mercury. Often comes on a small wooden boat. Very small.  Says Mercury on the back plate but really doesn't look much like a real Mercury.  Pretty rare.

10. K&O Pheasant:  This is the exact same motor as the early version of the Tornado above.  The only difference is that it's painted white and has the Pheasant decal on it.  Not sure if K&O made this version or someone else.  Thank you to Don Srybash for the picture.