300 overheating
I think the jetting is OK. It has a JD kit in it with a 170 main, and the red needle on the middle clip per his recommendation. The plug looked great, a light chocolate brown. It idles perfectly until it is about to boil over. Thats how I know I need to shut down the engine. I think the lean condition causing the idle to climb is due to the intense heat in the motor. The radiators, water pump and case cannot even be touched with gloves on even after 4-5 second gear runs on the street. I suspect a leaky gasket is letting superheated gas into the water.
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