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Makotosun

exhaust leak

  • Dogboy
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exhaust leak was created by Dogboy

Hello all.  i have done an awful amount of reading and now have a question.  I have a 175B and since I have had it there has been an exhaust leak where the end piece (about 18") goes into the main exhaust pipe.  The diagrams shows 2 o rings sealing this joint however this does not seal mine I still have some smoke coming out of the joint.  how do you guys seal this connection or can it be sealed?
04 Nov 2024 15:49 #1

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Replied by MarkT on topic exhaust leak

Have you completely and thoroughly cleaned the muffler/spark arrestor? (Usually needs to be done by burning out carbon or with a heavy duty chemical wash...  some have had it hot-tanked at a radiator shop)

(If o-rings are in decent shape, I don't remember leaks at that joint being a problem...  which is why I'm asking if perhaps muffler is clogged?)

A little silicone seal on the o-rings might help but it might be hard to get the muffler out again if you use too much?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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05 Nov 2024 08:24 #2

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Replied by Dogboy on topic exhaust leak

thank you Mark, i did put the exhaust on a fire and kept it on and going until it stopped smoking which it finally did. When I install the muffler into the exhaust pipe the o-rings either disappear or are missing a small section the next time i take it apart. And of course it is leaking at that connection.
05 Nov 2024 12:52 #3

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Replied by MarkT on topic exhaust leak

Sounds like you need to check the opening where muffler pipe fits into for burrs or other damage.  Maybe pipe opening is rusted out or something?

(Not sure how o-rings would "disappear" unless there was obvious damage?  I've never had that problem or heard of it.)
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
05 Nov 2024 13:05 #4

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Replied by Gr8uncleal on topic exhaust leak

Genuine Yamaha O rings?
05 Nov 2024 13:06 #5

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Replied by Dogboy on topic exhaust leak

yes oem o-rings. i will check for burs or sharp edges. the last one that i checked was missing about 1/8th of it so i think they are being torn and blowing out or coming out some how.
07 Nov 2024 18:15 #6

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Replied by Schu on topic exhaust leak

I've never tried this, but I wonder if it would help to put a few wraps of Teflon tape around the new o-ring.

Ok, so now you know what kind of backyard mechanic I am.

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CT1B, CT1C, JT1, JT2, CT2, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50, SCR950

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08 Nov 2024 03:59 #7

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