Back from the lake, we've go major overheating issues now. First off, the U shape elbow of the water trap gets way too hot without a water jacket. This was expected, and now confirmed. I'll have to build a water jacket onto now somehow. Bigger problem though, the engine is getting too hot and sounding the overheat alarm within about 4-5 minutes of idle time. Anyone know the flow of coolant water thru these motors ? Water still enters the exh. manifold in the original spot via the same supply as it did when in the Jazz boat. The only thing i've changed is the exit point. It used to flow into the 90* bend of the exh. manifold water jacket. I've had to eliminate that, but now pull water from the top of the manifold and introduce it on the downward side of the U bend. I would have thought that to be the same.... but not so much. After thinking about it awhile, i capped that exit point off, and made the water come out the factory tel-tail port on top of the head. I removed the plastic 1/8" pipe plug and used that for the water exit, plumbed it into the exh. 90* U bend. Still overheats.
Anyone know of a PDF file service manual for this motor ?
