From the Horizon Website:

Mounting the Engine
Step 4
The distance listed of 5 5/8” is a misprint, the distance should be 4 1/8” to 4 ¼”.
Step 6
Place a drop of loctite on each screw. The washers included are not split washers, but rather flat washers.
Step 7
This is a repeat of step 6 and can be omitted.


Mounting the Cowling
This step should state, “Mounting the Cowling”.

Step 2
There are no marks to line the cowl up with as stated in the manual and there is no mention of where these marks should be. You can move it back and forth slightly as needed to line up with the spinner. If using a large engine, it may not be possible to make the cowl line up with the spinner, and there will be a gap between the spinner and the cowl. Make sure there is plywood behind the locations where you drill for the cowling screws to provide adequate strength.
When cutting the openings in the cowling, start with an opening that is too small and then open it up slowly with a grinding drum on a dremel tool to prevent any damage to the paint.