The mid-size, Yellow Aircraft CAP 232 is waiting for the engine to be installed downstairs in my shop and it was about to get the Saito 80 when my flying buddy pointed out the weight and power difference between the 80 and 91.

According to quantummdoels.com the 80 is at 19 oz. and produces 1.3 hp. while the 91 weighs 18.3 oz and produces 1.7 hp. Any contest?