[GreenKeys] My spare motor for Model 15

[Jim Haynes]

That is the correct motor, and it should be OK to plug it in momentarily.

Now, that said, if it is sparking continuously there is something wrong,
as that motor does not have a commutator and brushes.  It says on the
name plate that it is a synchronous motor.

What it has is a centrifugal switch that disconnects the starting winding
when the motor comes up to speed.  If that is sparking continuously,
failing to open cleanly, then it is in danger of burning up the motor.
So there is a need to open it up and clean and lube the centrifugal
switch.  After that it might make a burst of radio noise when first
started, but after that it should not spark nor cause any radio noise.