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post #1 of 58 (permalink) Old 02-18-2018, 10:04 AM Thread Starter
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Won't Shift?

Didn't get very far this morning before suddenly noticing that my T120's transmission would shift up, but not down. Rode the bike home in 6th gear with some careful clutch slipping. The gear indicator confirms 6th. The clutch appears to function normally. When trying to downshift, the shift lever moves and stops, but it seems to move too easily and no lower gear is selected. The bike has never been dropped. No work has been done to the shifter or transmission. I never "drop" a clutch, or otherwise abuse a transmission. Anyone else have a problem like this one? Sure glad the bike is still under warranty.

Thanks!

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post #2 of 58 (permalink) Old 02-18-2018, 10:33 AM
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Sorry to hear about your problem. Odd. Keep us informed as to what you find out.
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post #3 of 58 (permalink) Old 02-18-2018, 02:38 PM
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I suspect youíre right. What a bummer! Can that be accessed without a complete strip down?
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post #4 of 58 (permalink) Old 02-18-2018, 03:05 PM Thread Starter
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I suspect you’re right. What a bummer! Can that be accessed without a complete strip down?
Good question! I suspect that enough access will be obtained by removing only the left side cover, but don't know for sure. The good news is that the shifting drum and forks are probably undamaged.
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post #5 of 58 (permalink) Old 02-18-2018, 05:34 PM
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Fingers crossed itís not too much of a pain for you. You did well to get it home in 6th, thatís one very flexible engine. Good luck.
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post #6 of 58 (permalink) Old 02-19-2018, 11:31 AM
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Originally Posted by tsmgguy View Post
The bike has never been dropped.
Could it have been dropped while parked, and then picked back up again, without you noticing it? That would be my guess.
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post #7 of 58 (permalink) Old 02-19-2018, 12:24 PM Thread Starter
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Originally Posted by Delta View Post
Could it have been dropped while parked, and then picked back up again, without you noticing it? That would be my guess.
It was shifting perfectly, and then not at all, without being parked in an interim. Seems odd to me, too.

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post #8 of 58 (permalink) Old 02-19-2018, 01:11 PM
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Originally Posted by tsmgguy View Post
It was shifting perfectly, and then not at all, without being parked in an interim. Seems odd to me, too.
Dumb, ignorant question. Is there some kind of return spring which might have broken?

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post #9 of 58 (permalink) Old 02-19-2018, 01:27 PM
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Originally Posted by tsmgguy View Post
It was shifting perfectly, and then not at all, without being parked in an interim. Seems odd to me, too.
So it happened mid-ride, that is very strange.

If the shift lever linkage is intact (sounds like it is since it has the same travel) then it is likely an issue with one of the parts in the internal gear selector assembly.

Glad to hear it is under warranty, let us know what they find!
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post #10 of 58 (permalink) Old 02-19-2018, 03:30 PM Thread Starter
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Originally Posted by lambroving View Post
Dumb, ignorant question. Is there some kind of return spring which might have broken?
That's my thought, too. Maybe part #28 below, the shifter detent arm return spring? Looks like the spring keeps the arm (#25) against the shifter detent, part #4. After each shift, the detent should engage in preparation for the next gear shift. If the spring is broken and detent spins but won't engage, then it would seem that the shifter shaft would in turn not be able to rotate the shifter drum, part #1. I think part #20 is the shifter return spring, which seems to be OK.
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