flyjoe540 thanks for the reply. The 60 series will handle .91-1.20 4-stroke Engine per the tower site.
http://www2.towerhobbies.com/cgi-bin...&I=LXBMM8&P=ML
The weight of a 1.20 4-stroke is about 35oz.
The McCulloch 31cc converted to glow should be are 3lbs. Your probably right it may push the limits of the stik.