I went out on the lake this weekend and I could not acheive more than 3500 rpms. In the last few months I have done a full tune up, changed to electronic ignition, and rebuilt carb.
I want to say that it has started after. Prior to I did not pay much atention. I had a few other problems that i was dealing with. It was really hard to start when it was hot and then wouldn't stay running. All that is fixed now and i am lokking into trying to get it fine tuned.