RE: Help!! I can't remove the head from my Norvel .061 :(
combatpigg is correct, you will drop much needed RPM with the standard plug. You will need high nitro as well. 25-30% is normal for this engine. I used to run 45% in mine and they started easy and ran fast.
If you are set on running a standard plug, your best bet will be a Galbret head that is set up to accept a Nelson plug. That was as close to the standard plug set-up as I ever got.
Good luck,
2FAST4U