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Makotosun

DT175C change shaft

  • Schu
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DT175C change shaft was created by Schu

Is this normal "change shaft" movement when the oil seal has failed?
Or do I need to do more than simply replace the seal?

youtube.com/shorts/mewFfp64CmU?si=40aTcuMTrEYkc-__
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
02 Dec 2025 08:43 #1

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Replied by MarkT on topic DT175C change shaft

Unfortunately, "normal".  New seal won't fix slop. That 74-76 shift linkage design was not one of Yamaha's best.

You can still find NOS covers for a decent price sometimes, hole for stub shaft in case might be wallowed out too though.  
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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02 Dec 2025 17:39 #2

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Replied by Schu on topic DT175C change shaft

Thanks Mark. I’ll replace the leaking seal and keep an eye on it. My bikes don’t see much use, so it might be fine for a few years!
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
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02 Dec 2025 18:46 #3

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Replied by Mark350 on topic DT175C change shaft

Cannot that be bushed? 
The following user(s) Liked this Post: pabdt
02 Dec 2025 19:26 #4

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Replied by pabdt on topic DT175C change shaft

this might require a case split to set it up right, but I wonder if a steel FLANGED BUSHING would work. For example, ID of bushing close to shift shaft diameter, then OD = custom. To compensate for flange head, a 1mm or so thinner seal could be used.

edit: mark350, was thinking same. 
________________________________________________
1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
Last edit: 02 Dec 2025 19:31 by pabdt.
02 Dec 2025 19:29 #5

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Replied by MarkT on topic DT175C change shaft

I'm sure it will be fine for a long time.  I don't know that I've ever seen one that wasn't worn?

I've packed the area under the shift sector cover full with thick grease and that seems to slow any oil leaks.
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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02 Dec 2025 21:09 #6

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Replied by pabdt on topic DT175C change shaft

www.facebook.com/groups/388917314609947/posts/3138570492977935/
________________________________________________
1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
02 Dec 2025 21:17 #7

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Replied by Schu on topic DT175C change shaft

Thanks for the Facebook link pabdt. I was able to view it even though I am not a Facebooker. Once I read thru it I saw the next post which also interested me but then it asked me to sign in……. I have no plans to join Facebook, but my wife is on it so I will continue snooping on her account! 

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Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
03 Dec 2025 07:53 #8

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