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What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

  • Patroll330
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What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro was created by Patroll330

Took my exhaust off for repairs and one stud broke off in the head . Does anyone know what stud threads go into the head and what size the threads for the exhaust threads for installing exhaust?
17 Jun 2021 07:11 #1

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Replied by Gr8uncleal on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Looks like it might be one of they funny ones - M6 in the cylinder and M8 for the flange (see photo).

Dimensions of screws and bolts are often (but not always!) included within a part number.

 
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17 Jun 2021 07:34 #2

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Replied by Patroll330 on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Bolt, Stud part # (392-14651-00) 90116-06146-00  is the part number just doesn't mention thread sizes .
Last edit: 17 Jun 2021 10:45 by Patroll330.
17 Jun 2021 10:40 #3

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Replied by RT325 on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

I think its just a common 6mm stud & nut. 6x1 pitch thread. No 3 & 5 in the link.
berkeleyhondayamaha.com/Parts/OEM-Parts-...00-0000-047337491974
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18 Jun 2021 03:33 #4

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Replied by Patroll330 on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Thanks never heard of Berkeley ,I used Babbits site looks similar. Thanks its a bummer not to have the size, some say 6M pitch 1
18 Jun 2021 18:56 #5

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Replied by MarkT on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

That part number is the stepped stud that Alan showed earlier. 

Small end that goes into cylinder is 6mm x 1.0 pitch. 

Large end that takes nut is 8mm x 1.25 pitch.
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
19 Jun 2021 08:01 #6

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Replied by msavitt on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro


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Replied by Sneezles61 on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Now this is funny stuff... I found a 6 volt horn for a VW... Its now mounted on my trail90! Talk about "inter changeable stuff"!
Sneezles61
19 Jun 2021 14:39 #8

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Replied by MarkT on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Those VW studs are for the oil drain plate underneath the engine that accesses the screen.  The little 6mm studs get overtightened and strip out of the case.  Then you drill/tap to 8mm and install the stepped studs.  I think they are too short for Yamaha exhaust studs but they did make a similar "repair" stud for the VW intake manifold that should work as it's longer.
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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19 Jun 2021 15:02 #9

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Replied by Patroll330 on topic What size exhaust bolt/stud on 1975 Yamaha DT125 Enduro

Yes , these are the correct threads sizes per each side of stud. Thanks
 
26 Jun 2021 13:02 #10

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