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#7
03-21-2008, 10:06 AM
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Like stated above, they let the water flow out when the T-stats open up. And are also your primary exhaust outlet when the engine is idling in the water. This is the reason why MOST 2 stroke outboards idle real fast on muffs, and then come back down to normal in the water. 2 strokers are EXTREMELY sensitive to exhaust back pressure, espescially at idle. Just ask some hot rodders what happens when you open the exhaust on a 2 trsoke without adding fuel
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