On the bench
The Ryobi started easily (with a starter) and ran without problem (not even any of that remembered deceleration vibration so that may have been prop related).
Prop used was an APC 18x6W.
Top 6800
reliable idle 1500 (probably due to the heavy APC wide prop)
I don't know if that was too much prop. Temps ran up to 260-80.
Top rpm fluctuates between 6500-6800.
Are those numbers normal for a Ryobi?
I suspect it would run slightly cooler without the coil blocking a large part of the front of the jug.