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Makotosun

CT1 transmission wanted

  • AlexRyan
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CT1 transmission wanted was created by AlexRyan

Hi. Looking for a transmission for my CT1.

Thanks.
20 Jun 2023 08:05 #1

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Replied by Ht1kid on topic CT1 transmission wanted

Greetings from Tennessee 

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 From your profile picture looks like a CT3
what’s wrong with your transmission?
20 Jun 2023 16:25 #2

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Replied by AlexRyan on topic CT1 transmission wanted

Hey thanks! Greetings from Michigan!

It's slipping out of 2nd and out of 5th. I know the 5th gear slip is common.

Edit: it's a ct1 with a gas tank from a CT3
Last edit: 20 Jun 2023 16:31 by AlexRyan.
20 Jun 2023 16:31 #3

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Replied by Ht1kid on topic CT1 transmission wanted

Check the tech library on this site for a service manual probably has some information on how to adjust and test your transmission
20 Jun 2023 16:45 #4

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Replied by MarkT on topic CT1 transmission wanted

2nd and 5th are on the same shift fork.

End of shift drum (under external 3 bolt cover) not snapped off? Retainer and shim in place (#15 and #16 on the "Shifter 1" parts diagram?)
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
Last edit: 21 Jun 2023 05:22 by MarkT.
20 Jun 2023 21:03 #5

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Replied by RT325 on topic CT1 transmission wanted

I'd better go look at a parts pic i'm thinking DT1 layout but i'm sure they're all the same design.
So hang about as might be apologizing [again] now i've posted all below while tired & grumpy.
Ok i'm awake now & thinking right.
Center fork slides gear 5 left & right for 5th & 4th [sitting on bike referring to left & right].
Second & third are controlled by the other fork moving gear 18 left & right for second & third.
I'll find a pic but here's the link. 
www.partzilla.com/catalog/yamaha/motorcy...70/ct1b/transmission

I agree with Mark, my first thought is the end broken off the selector drum caused by the chain bunching in there if it broke or got derailed.
Under the three screw cover as MarkT says.
Second & 5th gear are on separate forks though--not the same fork [insert argument here lol].
Center fork runs fourth & fifth, while left fork runs second & third
.
Second & fifth are both caused by gears engaging by moving to the left.
Therefore if the end brakes off the drum it can move to the right & if that happens ya lucky if it doesn't try to lock up.
Jumping out of 5th i wouldn't say is common on those, but there's a pressed on gear on the main shaft which drives second below & 'if it moved sideways' [very unlikely] it would let 5th gear next to it move away that slight amount.
Last edit: 21 Jun 2023 04:22 by RT325.
21 Jun 2023 03:43 #6

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Replied by RT325 on topic CT1 transmission wanted

Links below to gear train & selectors with drum.
Thought i was loading a nice big pic--but no.
photos.app.goo.gl/fpmTuLdytoyg4hxR6
photos.app.goo.gl/gqybCvT9VsaV9ov96
I forgot Welcome from NZ downunder.
Lots of help here. [some of mine even works at times lol].
Look forward to pics of yours. I have an AT1 [now 175--long story].
Last edit: 21 Jun 2023 04:26 by RT325.
21 Jun 2023 04:03 #7

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Replied by MarkT on topic CT1 transmission wanted

Tired and late... should have looked at diagram. Was going from memory on shift forks.

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Thanks for catching that RT325
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
Last edit: 21 Jun 2023 05:25 by MarkT.
21 Jun 2023 05:23 #8

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Replied by RT325 on topic CT1 transmission wanted

All good Mark. Sorry if i sounded grumpy. Fell asleep watching the news.
Reminds me of--Sometimes i wake up grumpy. Other times i let her sleep in lol.
The following user(s) Liked this Post: Ht1kid, Sneezles61
21 Jun 2023 06:43 #9

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