I was looking at my 1975 Suzuki TS185 and noticed something odd. on the bottom underside of the Exhaust there is a Large threading. nothing is threaded into it and after i had the engine running awhile a black liquid was dripping from the threaded hole. so i found a bolt that fit and i wrapped it in some plumbers tape and the leaking stopped. the hole is about 2/3 down the length of the exhaust and my dad thought it might have been for a vaccuum tube or something but i dont know. id guesstimate the diameter to be about 10mm being familiar with bullets and bolts. if you look closely i have circled the bolt sticking out of the exhaust in yellow.
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