Recently purchaced my first 4-stroke. 1996 Johnson 9.9, this motor has very low hours (may not have ever been previously run). I serviced the waterpump impeller and changed all fluids for GP. The motor will get to 210 at an idle, varified with a digital peromiter and thermomelt stick. Has good flow at tel-tale at all speeds. cools down imediately above 900 rpm. I have changed the thermostat (drilled releif per service bullitin) and rechecked waterpump assembally 4 times. all parts and assembily are correct. Do 4-strokes run hotter at idle than two strokes? should this motor boil water on parts of the head at an idle? 
