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Thread: TR-1 transmission/clutch?

  1. #1

    TR-1 transmission/clutch?

    OK, so I got the winter project (1981 xv920rh) cleaned up, full of new liquids, and running. I wanted to ride it a bit to see where it leaks before tearing it apart after it gets cold out...
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    Rode it last night down to Bike Night, and had an unusual situation: It pulls strongly, clutch engagement seems smooth starting up... but in 2nd gear, it feels as if the clutch is slipping maybe 50%... rev, and little forward momentum. Shift to 3rd and 4th and it revs and pulls you down the road as expected.
    Has anybody ever encountered a Yamaha transmission that seemed to slip in only one gear? (I haven't.)

    Thanks for any advice!

  2. #2
    Senior Member MadMax's Avatar
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    Is 2nd gear engaging properly, no machine gun noises?

  3. #3
    I wondered about that, but it seemed to click in smoothly, no machine-gunning, and clicked up to third as easily. Feels a lot like a slipping clutch, but since when does a clutch slip only in one gear? Once this rain gets out of here, I'll ride it some more, try to check for consistency of symptoms.
    It's a fun bike, BTW. LOTS of power. Feels amazingly big astride it, especially after the SR500.

    Thanks for the response!

  4. #4
    Senior Member gcrank1's Avatar
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    They do 'ride big'.
    Do I remember right that those have a sprag clutch? And if so, could that be it???
    '81 Yamaha SR500 Caff Racer
    '09 Suzuki TU250X 'The Silent Red Fellow'
    '98 Honda Shadow 750 ACE Deluxe
    In all things maintain your uprightness lest the road reach up and smite thee

  5. #5
    Haynes manual says they either have a coil spring clutch or a diaphragm spring clutch. Haven't figured which is in this model yet. Had never heard of a sprag clutch. Googled it - interesting design.

  6. #6
    Senior Member MadMax's Avatar
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    Humour me, what's it like pulling away in 2nd?

    Max

  7. #7
    Good question! I'll try to get some video tomorrow, as well as maybe show what it sounds like after the shift to 2nd. Supposed to be a clear day tomorrow, while today has been decidedly a... northern european day, if you know what I mean :-)

  8. #8
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    Possible clutch cable drag,
    If you have not already, remove the cable test it for excessive drag and lubricate.

  9. #9
    OK, some more info: It'll pull away in 2nd just like in 1st, with the usual feathering in of the clutch... I oiled up the cable, and that really reduced the effort to pull the clutch, so I was thinking that might be the solution.. Then I rode it a bit this afternoon, trying low throttle coming out of each shift, and then once disengaged, giving it a twist of the throttle sometimes. Seems to me that I can make the clutch slip in both 2nd and 3rd, by giving it some gas in a twist. Probably could in first too, but that gear is low enough that I just get into 2nd... If I slowly "roll the throttle on," no slippage. I wasn't exactly hoping for a clutch rebuild on this thing, but a person can't have it slipping like that... I suppose I could replace the cable, just to be sure... Any other ideas? Sure appreciate your sharing of wisdom on this!

  10. #10
    Senior Member MadMax's Avatar
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    Have you checked the adjuster by the LHS footpeg? Maybe someone has adjusted it too tight?

    The manual says to adjust the screw until it just touches the pushrod then back out 1/4 turn.

    https://www.tr1.de/pages/technics_ma...flg=0&pge=2019

    Max

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