I set out to find a servo that has a high operating temperature, all seem to be in the 50 to 60 C range. The search came up empty. Both the GP178 EFI and Roto 125FS use a Savox brand servo so that is what I ended up using although the specs are on the low side at 50C. Using the same SV1250MG that is used on the GP178 EFI engine. Rated at 111 in-oz of torque, the servo wasn't happy at high throttle setting as the spring is rather stiff on ZAMA carb, so the spring was unhooked. The engine is ready for tuning.