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Chapter 5
Engine Installation
Your firewall is pre-mounted but our customers can select from a wide variety of engine choices. It is nearly
impossible to cover every engine installation choice in this manual but we’ll cover a few. Your aircraft was
designed around the 100cc twin gas motors. Also, we have provided a canister tunnel and a tuned pie tunnel on
our Extra for those who desire quieter operation. Please consult the manufacturer for the installation of optional
canister or tuned pipe.
Your Extra 300-SP will also accept lighter motors like the DA-85. If using the DA-85, attention should be paid
to your hardware installation as it may need to be mounted towards the front of the aircraft for proper CG.
We will cover the installation of two popular engine choices in this manual, the DA-85 and the DA-100 motors.
Follow your engine manufactures instructions for any additional guidance. Let’s get started!
Place an “
” to ensure task completion:
What you will need in this chapter:
A DA-100 mounting template found in the back of this manual or a DA-85 mounting template found
in the back of the DA-85 manual.
Not Provided:
1/2” standoffs for the DA-100
1-1/8” mount for the DA-85
Four ¼-20 bolts 1-3/4” long for the DA-
100
Four ¼-20 bolts 2-1/2” long for the DA-
85
Four lock or compression nut with fender
washers
An engine in the recommend size range
4 ½ inch spinner
Propeller
A drill and drill bits
Center punch
Scotch tape for template
