I don't know jack about powerpacks but I did some investigating on the BFHP. It seems the typical symptom contains some misfiring or the engine starts to cut in and out, then followed by you not being able to gain more than say 2000RPM's. The reasons seemed to be varied and will probably need to be hooked up to a diagnostic machine. The most common problems seem to be a starter, coil ground, voltage regulator, timerbase, key switch, and even faulty spark plug wires. Type in "powerpack" on the "boats and motors" section and there is quite a bit of info. Best of luck Dave!