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Shift mechanism iss...
 
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Shift mechanism issue

3 Posts
3 Users
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tl1204
(@tl1204)
Active Member
Topic starter
 

Hello, So recently I started having an issue with my CT125 (same motor as the TL125) 1977. I put-on a new carb, check my timing, spark, jets, etc... and nothing has resolved my issue and today I think I found the problem...

What happens is, I can shift from 1st, 2nd, 3rd just fine no issues. Bike pulls hard and runs fantastic. The second I shift into 4th, does not matter speed, etc... it bogs down and kills the engine. Originally I thought my float height was off so messed with that, went back to timing, spark and nothing changed. I can shift back down to "N" and the bike fires up right away. Try it again, same thing. 

So today I popped off the clutch cover and checked over the shift star and spring roller piece. What is happening is the roller piece is getting caught in-between 3rd and 4th gear and similar with 4th and 5th when I test it by hand. I can shift the trans by hand 1,2,3 perfectly but the second I try to shift to 4th, bam...gets caught and the drive sprocket is really hard to turn which in return is bogging down and killing the engine. 

I am considering splitting the cases and checking the shift drum. Possibly bent fork? Maybe the roller thing for the shift star is at fault? I did have to replace the spring when I bought the bike but this is a relatively new issue. It was fine for roughly 100-150 miles. 

 

Any thoughts or tips to check into? Sometimes it'll shift on the bench really smoothly and I can go 1,2,3,4,5 and back with no issues but not very often. 

 

Thanks for reading! 

 

 

 

 

 
Posted : 30/08/2021 11:39 pm
Mick
 Mick
(@mick-penfold)
Eminent Member
 

Hi,

I think you've just about done everything apart from pulling the cases apart and checking for damage. Cleanliness can also be an issue if the oil is not changed enough and sludge can form. Get a parts book and ensure all the washers on the ends of the gear shafts are there as well as these sometimes get missed on a rebuild. Another thing I've found is that the position you have the gear change leaver makes a difference as well, I have mine pointing virtually straight up (even on my road bike) and change up gear using my heal. I've found if the lever is flat I can't get enough leverage to change gear smoothly.

Let me know if you find any damaged parts as I may have spares.

Regards

Mick

07780663239

 
Posted : 01/09/2021 12:45 pm
supremecitystore
(@supremecitystore)
New Member
 

Hi,
    Thanks for sharing such a  valuable information. 

 
Posted : 21/04/2022 11:11 am
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