I have a .90 -1.20 super chipmunk. It requires a .90 - 1.08 2c or 1.20 4c. what if any gas engine could I use? any help would be apreciated.

The engines in the 23-33 cc range should work well

The BME .90 would work well. The 20-30cc engines may be a little too heavy for the plane.

G20. Hangar 9 recommends them for their .60-.90 warbird series.