Never use ether in a spark ignition engine.
<snip>
Anyway WD-40 is the answer. Another feature is that if you
get a WD-40 fire going you can see it. Not the case with either. Also, WD-40
is a lubricant, (sort of), and you can buy WD-40
anywhere. Either is for diesels, WD-40 is for piston and rotary
engines.
Lynn E. Hanover