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Ah Ha! That makes perfect sense--especially since exhaust is carbon monoxide and....water. And the muffler is pointed upward, making the water drain to that hole. Just another one of those odd little things that comes with the curious invention that is the motorcycle.....It's sort of like a spit-valve on a trumpet or trombone I guess (random reference--sorry)
Now if I can just figure out how to get those muffler bearings out and the ignition cross-fire modulator timed.....
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