It's a J6R4SRC, and it suddenly quit peeing. I looked at the impeller, and it's fine, I ran a weedwhacker line into the pee hole and it felt clean, no dirt dobbers, etc. Popped the top off the thermostat housing, and there's a rubber diaphram in there that was torn, so I though, "Bang! Gotcha!" ordered up a new one, installed it, slapped it on the boat and still bupkiss. WTF?!?! Now it appears that I'm going to have to actually understand how the durned thang works. Anybody got an idea? It appears to be on the downstream side of the engine, but I don't see what the diaphram actually does. It has a small spring in a plastic cup, then a vernatherm, then the diaphram, then a bigger spring, then the cover. When I look at the exploded view on the BRP Johnson site for my model, they show a spacer above the diaphram mine doesn't use. Otherwise, the parts look the same. I got nothin' here............