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#1
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They are also an exhaust port. At idle most of your exhaust comes out of those holes. I've seen some Merc's tricked out with an almost "dry" exhaust using those holes. Makes 'em loud as hell.
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Captain Jon 
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#2
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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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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