mbilar! I'm not at the moment fully familiar with your set-up but have used the engine and the prop without problems. Here is my set-up for spinners and props. First Unless the spinner is a scale item or a student's cutsey item, I use a spinner nut.
If the spinner is a must:
Take some wet or dry sandpaper, fold over and cut a half-moon about prop washer size then a smaller one for the prop shaft. No need to be precise. TLAR method is fine. That Looks About Right. Use that s/p washer between engine and spinner backplate, grit to backplate. Maybe another between backplate and prop with grit to prop.

Check that when nut is tight it has not tightened against last thread of shaft. HAPPENS! Be certain that threads go inside the washer. Difficult to diagnose so sometimes I just throw in another 1/4" flat washer out of the 1/4" washer pile and that will fix that. [>:]

Now if you're prone to over-choke or prime or it's cold and you allow too much fuel into the engine before it fires, it will be a tad flooded and kick 'er right off. Happens !!

If you're flying below 40* outside, use a prime bottle with 1/2 gasoline and 1/2 glow fuel. When ready to start, do not choke or prime other than several drops in the carb of the prime bottle. Turn/flip the prop several times. Turn on the glow plug and start with throttle cracked at about 1/8 open. Try it -- you will like it. BTW do not use this in your fuel tank. Just for initial cold WX prime. [8D]