I just got a used saito .72 and im disappointed with its power. I have it on a .40 size twist. Im using 15% cool power and it only turns 10,600 on the ground with a 13x4W prop. It took about 3/4 throttle to hover. Does that sound right or is the engine beat. The compression feels ok but im not sure if the bearings are. I checked the valve tappets and they seemed pretty close to wear they should be.

Thanks for any info in advance.