I had the engine checked out in the Spring and all was working well. Had it out several times this year with no problems. Last weekend after several hours on the water we were going back to the dock and the motor started to cut out a little at higher RPMs. I usually run between 4200 and 4400 RPMs when heading back and when I was running 4000 RPMs or less everything was fine but when I went over 4000 RPMs it started to cut out. Not a big problem yet but I wanted to take care of it before something more difficult developed. Is this a carburetor adjustment or something else to look at? Any guidance will be appreciated. Thanks.