I have an Eska 15hp 1982. I had to make a water cover gasket for it (I cleaned out all debris from water jackets) , and then I got it running. Like the manual said, it took about 30 seconds to spit water. It got very warm (as the manual said). Powerhead temp was about 105 when I shut it down. I didn't want to overheat. Pump didn't seem to pump good at low idle. It shot a descent stream at start position. Didn't look solid like the Gamefisher (Eska) 15hp I seen on youtube video. Thermostat has been removed (yes the manual listed a stat for some Eska's). Impeller was changed a year ago by previous owner. Any ideas? I only ran it for about 3 or 4 minutes, and it seemed to get warm fast. I did backflush tell tale (with 10 - 15 psi of air). It bubbled my tank water (when I plugged exhaust ports). Re-tested, and the same results. My Ted Williams (Eska) 9.9 with weak pump I could run for 10 minutes, and I could easily touch powerhead. The 15hp seemed to get too warm to quickly. Any ideas? Thanks in advance. Sorry for the novel LOL.