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front sprocket question

Discussion in 'XJ Technical Chat' started by mainexj550, Jun 18, 2007.

  1. mainexj550

    mainexj550 Member

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    I had my front sprocket cover off the other day to inspect an oil leak behind it.

    I found that the oil is leaking from at least the output shaft of the front sprocket and maybe the shifter as well.

    Are these difficult to change? Can I remove them and push in new seals from the outside of the case? Or do I need to access these from the inside of the case?

    Where is a good place to purchase these seals? I find seal/gasket kits for 650, 750 and the likes. But they are all shaft driven bikes and mine, well isn't.

    The other thing I found behind the cover is my biggest concern. My front sprocket is a little loose. It can kind of float around on the shaft. Its bolted on normally with the interlocking cover. I don't have any other motorcycles to compare this too so I don't know if this is normal. It makes me nervous.

    Is this normal?

    thanks
     
  2. tonyp12

    tonyp12 Member

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    I also have an xj550 and my front sprocket is a bit loose as well. I do not believe it is an issue. Remember someone on this forum saying not to worry about it. I have not had a problem wit it.
    Sorry, don;t know about the leakage/seal issue.
     
  3. SalCycle

    SalCycle Member

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    I don't think it's a good thing if it's loose. The shaft (more than likely) is going to be made out of harder steel than the sprocket. So, this means that the sprocket is going to suffer wear earlier than the shaft.

    Check for wear on the shaft splines--are the corners rolled?--are there notches where the sprocket sits?

    Check for wear on the sprocket.

    If the play is coming from the sprocket--and the shaft is in good shape--change sprocket! If you keep that worn sprocket on the shaft, it'll damage the shaft. Sprockts are cheap--both in labour, and price--in comparison to changing out that shaft.

    Even if there is a little wear on the shaft, make sure you've got a good sprocket on there. Because of the play, you'll get premature wear on your sprocket. It might be worth it for you too keep a good sprocket on there and leave the shaft. I dunno.

    Good luck.
     
  4. Danilo

    Danilo Member

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    Naw.. the Darned Sprockets are made loose .. they come that way brand new.
    Seals Can and should be replaced (see yr Dealer, Yama Seal quality is worth paying more for) Use a drywall screw to pull them.
     
  5. mainexj550

    mainexj550 Member

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    my common sense agrees with SalCycle. Any play on that sprocket will cause accelerated wear on one of these parts.

    But the way its designed, attached and held to the shaft makes it look like it should have play.

    Anyone else though, I have contradicting responses here. And it sounds like I'm not the only one with a loose sprocket.

    How many miles does a chain/sprocket usually go for?
     
  6. tonyp12

    tonyp12 Member

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    Better to have a sprocket loose than a screw loose.
    :lol:
     
  7. SalCycle

    SalCycle Member

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    Right, so...my comment is not xj specific, but rather a general comment about splines and how they "should" fit. It's been a while since I pulled my front sprocket...I can't remember if there was any play, but there may well have been. But that sprocket also had a few miles on it as well. I've got a new one on the way. THese sprockets may well come with a little play; I'm not sure.
     
  8. mainexj550

    mainexj550 Member

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    Let us know if the new one has play.

    I cant seem to find the seal for the output shaft that the front sprocket attaches to in the yamaha parts manual. any ideas?
     
  9. Nick

    Nick Member

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    On the XJ550 H and J model, the oil seal is shown in the transmission parts blow up. The part number is 93102-35109-00.

    I'm wondering if the "free play" that this thread is talking about, could it be a side play and not a "rotational" play.
     
  10. MiCarl

    MiCarl Active Member

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    93102-35109-00 OIL SEAL

    Item 20 in this diagram:

    [​IMG]

    Sure looks to me like the oil seal runs on the collar (19).

    I'd suggest replacing that and the o-ring ( 18 ) while you're at it.

    90387-257A3-00 COLLAR
    93210-22298-00 O-RING
     
  11. SalCycle

    SalCycle Member

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    Will do.
     
  12. RickCoMatic

    RickCoMatic Well-Known Member

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    "Is this Normal?"

    No. It is not normal. But, it is something that is becoming commonplace among "Off-road racing bikes"

    To save the weight of a half-teaspoon of salt ... racers are cutting, drilling and leaving-off parts.

    To accommodate the demands to "Keep it light" aftermarket sprockets are being made -- "Disposable."
    Out of aluminum.

    Used for an event or two and replaced.

    If you bought a new sprocket lately ... for a "Lightweight; small engine" ...
    you might have an aluminum sprocket.
    Not the best choice for a road bike that's going a whole lot further than around a race track a few times.

    Stick a magnet on that sucker ...
    If the magnet don't stick you need a new sprocket.

    Hopefully, all you need is a sprocket.
    If that ain't it ... you need to do some Dial Gauge measuring!
     
  13. Old-Grunt

    Old-Grunt Member

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    that way of holding sprockets on is used on several bikes,they are all a bit loose,unless its really loose I wouldnt worry about it,although it wouldnt hurt to check your splines on shaft and sprocket,I bet its fine though.
    I've never heard of a aluminum front I dont think anyone makes one it would be shredded at the first hard launch,there is a lot of aluminum rears though,its purpose is to lighten unsprung wt.
     
  14. RickCoMatic

    RickCoMatic Well-Known Member

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  15. Old-Grunt

    Old-Grunt Member

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    I stand corrected

    8O yikes I would of bet you couldnt find a front aluminum,I bet they just playing on guys that have to have the newest thing,the sprocket in the link you posted looks like pretty shoddy workmanship
     
  16. stereomind

    stereomind Active Member

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    my 550 also has a "floating" sprocket. The movement is not rotational, it just moves a tiny bit parallel to the shaft. I have not seen any wear on either the shaft or the sprocket in that spot, 10K on bike.
     
  17. mainexj550

    mainexj550 Member

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    It is side to side play and not rotational play.
     
  18. Danilo

    Danilo Member

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    Once again .. with the Yama two screw mount system the Countershaft Sprockets ARE loose.. even with brand new OEM bits. Note that the splines are more like keyways than splines, this spline design implementation has proven V hard to damage.. for more that 30 years now :)
     
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