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Mystery O-Ring

  • ZTatZAU
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Mystery O-Ring was created by ZTatZAU

I'm in the process of reassembling my 74 GTMXA and don't know where this O-ring came from.

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I'm usually pretty careful keeping track of parts but this O-ring just appeared in my container of parts trays from the bike and engine.  I'm hoping it shouldn't have gone somewhere inside the engine cases I've just reassembled.

Any ideas?
ZT
10 Dec 2025 17:44 #1

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Replied by pabdt on topic Mystery O-Ring

was there an oring on the muffler to exhaust?
________________________________________________
1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
10 Dec 2025 18:46 #2

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Replied by ZTatZAU on topic Mystery O-Ring

"was there an oring on the muffler to exhaust?"
I'm not sure where you mean, pabdt.
I took the exhaust pipe, muffler, and tail pipe off as a unit.  Didn't separate anything and didn't remove any orings.

The mystery o-ring feels to rubbery to be used on the exhaust.
10 Dec 2025 19:31 #3

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Replied by pabdt on topic Mystery O-Ring

Well, I look forward to seeing what that was for. Cant think of anything other than carb large enough to use it. Maybe some type of seal in that area? air cleaner, intake, etc...
________________________________________________
1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
10 Dec 2025 19:46 #4

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