15
Engine in place on scraps of wood as spacers.
Tracing around mounts.
Using a washer to draw holes for drilling.
Engine
If using the Zipp 3409 mounts you can simply
bolt your engine in place.
If not, continue reading. You should be able to
use either the front or rear set of holes with your
mounts.
Install your engine on its mounts, then set the
engine and mount in place.
Use some scraps of plywood under the engine to
space off the floor.
Use about 1/8 inch in the rear and 3/8 inch in the
front (pull start end).
Use a piece of 1/4 brass tube or drill bit to make
sure that the engine is aligned with the holes in
the rear bulkhead and floor.
Put the ¼ inch tube or bit in the collet and snug it
up by hand.
If you want to be precise about the shaft tube
location, you can slip a piece of 9/32 brass tubing
over your ¼.
This will then be a nice slip fit to your 5/16 shaft
tube.
It should line up perfectly. If not, put scrap wood
spacers under the engine to get it to the correct
height and angle.
Sight the engine from the front or rear. Be sure
that it is not tilted to one side.
Once you are happy with the engine placement,
draw around as much of the rubber isolators as
you can. Remove the engine and use a flat
washer about the size of the rubber isolators to
draw a center hole.