If you are using the regular Cool Power and not specifically the 4-stroke Cool Power, you don't have adequate oil content. The 4-stroke blend contains 18% oil but the regular does not state an oil content (at least not the last jug I bought). Try switching to a fuel containing AT LEAST 18% oil such as Wildcat 2 & 4-stroke. I had a similar problem the first time I ran my 70 Surpass, but it didn't seize, just ran hotter than he**. I switched all my engines to 18% oil and they run much cooler and 400-600 RPM faster. Good Luck.