Have a coolant leak in the hardline that wraps around the back of the engine where the carbs are. Pisses out good when you give it a rev. Is it just an oring in there? Nothing special? Just picked up this machine and going over it. Im also not entire sure how much noise from the head at idle is normal on these I know they make a bit of noise but not sure how much. Almost like a chain dragging noise and ticks at slow idle when reved up sounds normal and healthy. I might have to look into the idle speed.