I've got a Coleman/Powermate 4,000 watt generator model : PM54A4302 with a B&S 8 h.p. model 194412 engine. I got it from Craigslist last summer (2016)cheap, I went through it, carb rebuild, fuel lines, etc. removed end bell cleaned it up inside (brushes like new), ran well, produced 120v and 240v no problem at no load.....that's the problem. Went to use it this week from the storm as it knocked out the power, started right up, checked the output voltages and Hz good so I plugged it in and the engine slowed down to a point where elec. generation was 90v AC. Removed load, engine went back up fine and voltages were all good again. Even putting a 500 watt halogen work light slows the engine down, voltage to 110v and 60 Hz. A 1,000 watt draw gives me 93v with 56Hz with a nice rpm drop. I checked the governor preset (from my B&S repair book) RPM and set it for 4,250, then set the engine for 3,750 rpm top no load for 3,600 rpm 60 cycles. Then removed the end bell again and changed the capacitor as the old one looked a little "lumpy". Still the same, runs well and produces well at no load. Just wondering if I am missing something?