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Is This A Clutch Or Sprocket Bearing Problem?

Discussion in 'Supersport (1974-2007)' started by chueewowee, Dec 14, 2017.

  1. Folk, please help with a pointer or two: I have just sorted my ignition with new pickup coils and was thrilled, but all of a sudden I ran into judder on pick up in gear. Revs fine out of gear.
    Had to slip the clutch a little in traffic and keep to get home a short about two miles. With a fair few revs goes a bit better. Heard squeal two or three times, when taking off in traffic.

    Prior to the coil fix, I had experienced what may have been increased judder in low gear in traffic, but nothing like this, which is incapacitating, and dangerous.

    I myself doubt gears, but being ignorant of these matters on the ducati, I cannot be sure where to start looking other than stripping out the clutch or rear sprocket carrier bearing

    (Of course, I should have a nicely adjusted chain)

    Ta.John
     
  2. Chain is indeed the first thing to look at.
    Doubt it's either sprocket or clutch from what you're describing.
    A 14 tooth front sprocket is an easy mod on your bike and will make it less snatchy
     
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  3. It does need adjusting; it would have warmed up and slackened after setting off, but i thought immediately, and still think after a further two miles that its something else because of the very bad nature and squeal of the snatch and judder.

    Shall adjust chain and try am. , as am tied up right now.
    Cheers.
     
    #3 chueewowee, Dec 14, 2017
    Last edited: Dec 14, 2017
  4. Sounds as though it could be a clutch issue, try the chain first of course but I doubt it’s that, the clutch centre bearing is a known weak point on the 900ss, very unlikely to be the gearbox if you are hearing squeals as your gears run in oil.
     
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  5. Check clutch basket fingers. Smooth the notches a bit with a file as they can cause plates to stick.
     
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  6. good point.
    By the way its a 600ss with wet clutch.
     
  7. Thanks. A useful tip, because I'll likely be dismantling the clutch.

    What about the possibility of it being the sprocket bearing?
     
  8. The Clutch Bearing is SKF 6201-2RSH (note: it is not a C3 type as many people sell - the C3 is for higher revs / heat and has slacker tolerances to allow expansion - as used on the timing belt tensioner rollers - the clutch bearing runs slow and cooler so needs the tighter non C3 specification).
    I have started selling these with my Timing Belt Kits and Tensioner Roller Bearings as a set (Priced at 15% discount from my Ebay Prices for forum Subscribers).
    If you are stuck for the one bearing I will send you one for £5.00 including 1st Class Post to help you out. (6.32 from Simply Bearings with 1st Class post).
     
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  9. on my 900 ss I had some squeaking from the clutch ( no snatching mind) tbh it sounded like a cricket chirping.
    turned out to be the pressure plate bearing... Don't know if this helps you in anyway but I like talking about stuff. .
     
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  10. Ah, wet clutch may be a different bearing :thinkingface:
     
  11. You can probably strip the clutch without draining by laying the bike 45’.
     
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  12. I thought it was going to be a cricket sat on the engine chirping, you spoilt the story dude :(
     
  13. I took the chirping/squealing to be from the tyre due to extreme snatchiness but that’s seems unlikely on a 600ss;)
    Iirc, replacing the pick ups is likely to affect the ignition timing unless you take great care to ensure the pickups go back in exactly the same place with the he same air gap - could this be the problem??
     
  14. I checked for timing and gap thoroughly. Bike started and revved lovely. Warmed up thouroughly and idled beautifully for a good long time and then was fine to ride on for a mile. Still revs properly, without engaging in gear, and slipping clutch.
     
  15. Most kind to offer. If Anyone has info on this... post it up please.
     
  16. It’ll be interesting to see.
    I feel more confident now in taking a look.
    Ill check the sprocket bearing in neutral by hand, chain off if neceassry. Perhaps i ought to do that before i look at clutch.
     
  17. I’ll look into that because i have so much town riding.
     
  18. If the problem only appeared directly after doing the ignition work I would still start with that as the main suspect, regardless of how carefully it was done, first rule in any investigation is “what’s changed” so if the only thing that been changed is the pick ups etc then suspect that operation, engines run differently under load to when in neutral, I had an issue with and old Honda where it would start, tickover and rev cleanly through the range but would barely pull off in gear, so don’t think that because it revs cleanly in neutral everything is fine, good luck with finding the issue.
     
  19. I think more clarity is needed about the symptoms.
    A clutch release bearing will be noisy when the lever is pulled and stay noisy ntil it is released.
    Graunchy plates will make a noise as they take up the drive from rest.
    I regard snatchiness as the drive train constantly tightening and releasing when in gear at slow speed, making it impossible to ride smoothly without slipping the clutch.
    Which of these, if any, describes the problem?
     
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  20. ON tha basis, we can rule out the clutch bearing. Sounds more like the last. Thanks for that insightful set of clues. Off to test now.
     
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