2012 Sherco clutch

Discussion in 'Trials' started by broncobowsher, Mar 20, 2017 at 12:20 PM.

  1. broncobowsher

    broncobowsher Long timer

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    After this weekend I need to find what is going on. The sometimes sticky after sitting I can live with. But I am getting a lot of clutch drag. And a touch of sticky even when warmed up that I don't remember before. Grab a handful of clutch and it still drives until you crack the throttle and shock it loose. I've owned it for 5 years and it was a demo for a bit before that. Just a bumbling Novice rider. The clutch feels correct. Feels like it is getting enough stroke that it should be fully releasing.

    I'm hoping to pull the clutch cover off soon and take a look around. So what should I be looking for?
    #1
  2. Boom Boom

    Boom Boom Been here awhile

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    Put in 3rd gear, front wheel against a solid wall and give the clutch a good hard work out, then change the oil. That might take care of it without needing to have a look.
    #2
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  3. jonnyc21

    jonnyc21 Trials Ninja

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    I would guess your seeing two things combine. 1st is the oil might just need a change and second would be glazing of the plates. (slim chance the glue between the fiber pads is rubbing on the steal disks)
    The glazing will cause the pads to be smooth an this creates an almost suction like affect sticking them to the steals. This can be fixed by sanding the fiber plats with some sand paper, or the 3rd gear wall trick might work (haven't tried that however)... Oil, well change it to improve that side of things...
    #3
  4. broncobowsher

    broncobowsher Long timer

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    3 oil changes and it isn't getting better. Even tried some motorcycle transmission oil I had instead of ATF with no change. So far the advise is they clutches are not glazed enough and need some abuse, or they are too glazed.

    Either way it is sounding like everyone is pointing to the clutch frictions and steels. Maybe just order up a clutch kit and have it handy before I open it up?
    #4
  5. motobene

    motobene Motoing for 46 years

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    First make sure your clutch lever is adjusted well.

    Pull the clutch cover off (4 screws and a delicate small o-ring). Cover off, watch the pressure plate move when you stroke the lever. Does it rise evenly? It should. If not, move springs around until it does.

    You'll like your clutch much more if you remove two springs across from each other. Leave the screws and washers for the springs out too. Lose two then move spring around for even rise.

    Another thing that causes drag is uneven thickness or messed up fiber plates. Pull the plates out (record their order) and inspect them. You probably have two types of fiber plates, one without notches in the tangs and one with.

    Measure the plates. Find the thickest spot on each fiber plate and reassemble the clutch clocking the thicker area of each plate 120 degrees apart. This requires calipers or better yet a micrometer. The thickness difference should be minor.

    To get rid of sticky clutch (plates worn too smooth), with 120-grit sand paper very lightly sand the fiber and metal plates to put small scratches on the mating surfaces.

    Refill with Maxima MTL 80-weight gear lube. Trust me. This specific oil is the tits for Sherco clutches.

    If you think you need new plates, get them from RYP. Metal plates if not warped or gouged can typically be re used.

    The later clutches have 2 or 3 race plates, and the balance the long running standard plates (6 fiber plates total). Fiber plates aren't cheap, so you should do the above tweaks first.

    I can't cover all the details, but this should help you.
    #5
    LemmeTry, ADVCoop and jonnyc21 like this.
  6. jonnyc21

    jonnyc21 Trials Ninja

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    Well that eliminates the oil, so then yes the clutch pack work as indicated by bene is your best option.
    #6
  7. broncobowsher

    broncobowsher Long timer

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    Thanks Bene! Now to find a little time to actually dig into this.
    #7