I have an Evolution 15cc pumped carb gasoline engine. HS set 1.5 turns out and LS set 4.5 turns out as manual says. Everything is connected. Prime it, turn ignition on and nothing happens not even a kick.

Just received this engine as a replacement from Horizon Hobby for one that worked but the throttle barrel was binding. Put the replacement on my airplane that the other engine came off and it will not fire up.

Getting plenty of gas and air. Maybe the spark plug is bad...on a new engine?

Any ideas?