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that should be chuggin water out the back at idle. ka-whoosh,,,,ka-whoosh.
poppet valve is blocked.
it looks like a small t-stat housing way down low, under the computer.take it appart. rubber seal and all, and clean the sand out.
the spring. the plastic thingy. etc...
it olny goes one way, so put it back in right.
hot-rodders drill holes in the back of the housing to make them louder/relieve exaust pressure.
look on iboats.com in the yamaha section. everything you ever wanted to know about those old yamahas.
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