I recently converted a well used ST 2500 to gas. The results were quite suprising.

Fuel - 87 octane mixed with 10% no name brand 2 cycle oil
Carb- Walbro WT 225A with a 1/2 inch venturi.
C&H ignition set at 28 degs. BTDC at WOT
RPM - 7600 settling down to a steady 7400 with an 18x10 APC prop. A smooth idle at 1500 rpm

I then took off the ignition and replaced the spark plug with an O.S. #8 glow plug
Fuel- Morgan Omega 5% nitro with castor oil
Carb was the original 9 mm ST carb.
RPM - 7300. Idle was not checked.

I never expected the gas conversion to out perform glow fuel. Perhaps its the better breathing with the larger Walbro carb and the more precise spark timing.
Any comments?

Dave G.