/thanks for all the great tips on prop balance. Now I am up against mounting a saito gk80 on a sig senior arf. Yea I know maybe a Little too much but as they saying goes bigger is better. I like it that way . what I am concerned about is mounting the cowl . when engine is in center position to fit cowl , my center line on the tank is maybe 1/2 " lower than the centerline on the carb.The saito manual recommends that the tank be mounted 5 mm lower than the carb center.,anyone that has tips on this type of installation would be greatly appreciated. thank for all the advice guys.