Menz 21x10 "S" @ 7100 rpm.
Amsoil series 2000 2-cycle mixed as recommended at 50-1.
Unlimited on my 16.3 lb Sukhoi and some speed too!
Bisson pitts muffler with the pinched ends cut off.
I think I gained about 100 rpm from this mod.
The high speed needle is tweaked to max rpm and the low speed needle is as lean as I can go and still maintain a decent transition.
I do not like running rich......it fouls plugs, makes low power, makes carbon deposits, and can cause rings to stick/seize.
Thanks
John