Is there a way to test a powerpack to see if it is going bad? I have a 99 Stratos 295PEDC with a carbed Johnson 200 and a 5 1/2" CMC j/p. The prop to pad is 3 1/2" below right now. I'm getting 57.7 mph(gps) @ 5800 - 5900 rpm's and this seems slow for this boat. The prop is a 24P Raker. I think the prop has been worked on because there are numbers engraved/stamped on it that aren't original markings. Any help is greatly appreciated.