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Makotosun

Nice Pair!

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Replied by pabdt on topic Nice Pair!

that sounds AND looks great!
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1969 Yamaha CT1 175
1969 Yamaha DT1S 250
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.


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06 Aug 2026 13:45 #11

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Replied by Schu on topic Nice Pair!

Thanks.
Unfortunately I have to go back into the clutch side and figure out why it’s not disengaging when I pull the lever. My adjustments up at the bars and down at the engine do nothing……..
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A (2), GT80B, DT100B, DT125B, DT175B, DT175C, DT250B (2), DT400B, Z50

Someday, you'll own some Yamahas
06 Aug 2026 14:15 #12

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Replied by Schu on topic Nice Pair!

Clutch was fine. Plates were just stuck together which is odd because I had the clutch apart so I could measure plates and springs.

Took it for a ride…….and it won’t up shift. It finds first and neutral but that’s it. I could use some suggestions because I’m not a tranny man. So far all I’ve done is verify that the shifter isn’t hitting the side case. Not that that’s ever happened to me. 

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Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A (2), GT80B, DT100B, DT125B, DT175B, DT175C, DT250B (2), DT400B, Z50

Someday, you'll own some Yamahas
07 Aug 2026 09:37 #13

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Replied by pabdt on topic Nice Pair!

This is a DT360A. Maybe it will help. Same trans I think for most part.

Make sure the RED dots are aligned on EACH OTHER. In this picture, they are not as this was during dis or assembly. Maybe check out the spring and see if installed correct on trans shaft. Last, maybe needs adjustment at shifter shaft to center rachet where you want it. 

The TRANS SHAFT has dot at end of teeth that I THINK is meant to align w/the TEARDROP pointer on the shifter shaft

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════════════════════════════
1969 Yamaha CT1 175
1969 Yamaha DT1S 250
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.


Last edit: 07 Aug 2026 16:13 by pabdt.
07 Aug 2026 16:00 #14

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Replied by Schu on topic Nice Pair!

Thanks! Looks like I’ll be going back in the right side cover….again. My grandson is staying with us until Monday, so I won’t get at it until later next week. I hope I don’t end up having to split the cases. 
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A (2), GT80B, DT100B, DT125B, DT175B, DT175C, DT250B (2), DT400B, Z50

Someday, you'll own some Yamahas
07 Aug 2026 16:30 #15

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Replied by Schu on topic Nice Pair!

Looks like my linkage is out of position which is odd because I have a photo from when I first took the clutch apart and the linkage was correct.

First photo was at tear down and the second photo is what I see now. Not sure how it got misaligned. Hopefully that’s all that’s wrong. 

I just need to figure out the correct method to realign them……

imgur.com/a/VaspR7l
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A (2), GT80B, DT100B, DT125B, DT175B, DT175C, DT250B (2), DT400B, Z50

Someday, you'll own some Yamahas
Last edit: 09 Aug 2026 12:29 by Schu.
09 Aug 2026 12:03 #16

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Replied by Phyllo on topic Nice Pair!

That sounds crisp and clean, nice job!
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10 Aug 2026 06:30 #17

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Replied by Schu on topic Nice Pair!

Shifting issue resolved. Thanks for your tip pabdt. It was the shift linkage being out of alignment.

Now I have a new issue and again looking for suggestions. I rode it for a while today and it runs awful. Acts like it’s all loaded up. It does come alive at wide open throttle. I plan to go thru the carb again. It’s been thru the ultrasonic cleaner many times already but the tank had rust dust in it because the inline filter is loaded with it. The float appears to be sticking because it is peeing fuel out the overflow.

But my real concern is this….. I just had my first runaway engine. OMG! I had just shutoff the fuel supply like I always do. The RPMs picked up a bit like they always do as it runs out of fuel. But then it went full on screaming and it wouldn’t shutoff. I wasn’t about to pull the plug wire with my bare hands. I wasn’t going to try and put it in gear to stall it. Not when it’s screaming past redline. It eventually died out but it seemed like it took several minutes. Probably wasn’t but man I was in panic mode. I can’t believe it didn’t come apart.

So I assume I have an air leak. I replaced every single seal with genuine Yamaha seals. I put a new Yamaha gasket on the intake. I did not pull the top end, so I did not replace the head or base gaskets. But the engine supposedly went thru a recent rebuild at the Yamaha dealership that the previous owner dealt with back when he raced this bike. And he said it has very few hours on it.

So I guess my next steps are to do a leak down test and a vacuum test. I’ve only done those tests on one of my 175s, but I have the stuff to do them now. Any other suggestions would be greatly appreciated.

I now have a zip tie loop attached the plug cap in case this happens again. 

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Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A (2), GT80B, DT100B, DT125B, DT175B, DT175C, DT250B (2), DT400B, Z50

Someday, you'll own some Yamahas
Last edit: 13 Aug 2026 14:56 by Schu.
13 Aug 2026 14:55 #18

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