RE: Flew new Escapade
Spinner nuts don't change the RPM much, especially with a 10" prop on a .46ax. I run 11x6 or 11x7 on most of my .46 engines. My .46ax's turn about 13000 to 14000 rpm with 11x6, 16k with a 10x6. Sounds like you may have run too lean and maybe got the plug too hot. Try a new plug and a click or two richer on the HS.