Rear Sprocket - Tech Info
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  1. #1
    Senior Member ezman671's Avatar
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    New 15/52 sprockets.



    New rear sprocket has the area where the bolts go recessed. Which way does it go on? Does it matter?

    I will put it on with the recessed side toward the left side (bolt head side) unless someone knows different.



    Locking Tabs - Why are they on the head of the bolt with nothing on the nut end?

  2. #2
    Senior Member biglefti's Avatar
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    Quote Originally Posted by ezman671 View Post
    New 15/52 sprockets.



    New rear sprocket has the area where the bolts go recessed. Which way does it go on? Does it matter?

    I will put it on with the recessed side toward the left side (bolt head side) unless someone knows different.



    Locking Tabs - Why are they on the head of the bolt with nothing on the nut end?




    You are putting it on in the correct orientation. You wouldn't want a gap between the sprocket and wheel hub that would warp the sprocket when you tighten the bolts. As to your question about the locking tabs. They make no sense to me either. The only way they would work is if the holes in the sprocket that the bolts go through were threaded. Since my bike did not have the original sprocket when I changed mine out, I don't know if that is the case. I'm not too worried about it though as mine does have self locking nuts on the bolts so even if they were to work their way loose, I would realize the issue long before it left me stranded somewhere.

  3. #3
    Senior Member GlassAnkles's Avatar
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    recessed side facing out is right. i just put on 15/49's and left those dumb locking tabs off. i used new shorter bolts with a little blue loctite to secure it.
    11 ninja 1000

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  5. #4
    Senior Member lizrdbrth's Avatar
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    The point of the locking tabs is that they're softer than the sprocket material, allowing some "crush" to prevent spinning of the bolts and to get a better grip on the hardened metals, allowing more grip for less torque on the bolts. The tabs augment this. Hardened washers allow sliding between themselves and the hardened sprocket. Kinda hard for some to get their head around, but hardened washers are not an improvement over the factory setup. If they were Yamaha would have used 6, 5 cent washers instead of bothering with the expense of manufacturing the tab plates.



    Second best to the factory setup if yours are missing or trashed would be hardened bolts with mild steel washers.



    On recessed sprockets I just let the recess bend the tabs as the bolts are tightened.



    I have a wheel here with oblonged, cracked sprocket mounting holes from the PO using hardened round washers instead. Not pretty.



    I can explain it to you, but I can't understand it for you.

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  6. #5
    Banned qwerty's Avatar
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    The lock tabs prevent the bolts from turning, shifting, and wallowing out the holes in the aluminum hub. Repair manual requires Loctite on the nuts. Use Loctite. If using the $%#$%% thin hub JT Sprockets sprockets and can't source hardened, fine-thread hardware, place the sprocket on the hub, run the bolts through the lock tabs, through 1 or 2 hardened flat washers so the nut doesn't run out of threads, through the sprocket, through the hub, then apply loctite and torque the bolts to 25ft/lbs. You do not want the threads to contact the hub as they will chew it up--be careful when using shorter hardware that the shoulder is exactly the right length.




  7. #6
    Senior Member lizrdbrth's Avatar
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    If you have an aluminum hub I'll send you a steel one like the rest of us have plus a couple hunnert dollars fer it



    Gawd, I hate that 36 pound anchor at the end of my 13hp



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  8. #7
    Senior Member phazer's Avatar
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    i just changed out my stock rear sprocket with a 47 tooth JT sprocket. two of the locking tabs were the same but one was a little different so it did not fit inside the recessed part of the JT. no biggie though i just did some lite grinding and it slipped right in.

  9. #8
    Banned qwerty's Avatar
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    Quote Originally Posted by lizrdbrth View Post
    If you have an aluminum hub I'll send you a steel one like the rest of us have plus a couple hunnert dollars fer it



    Gawd, I hate that 36 pound anchor at the end of my 13hp


    Shhot, my bad. Potmetal hub. It's quite soft.




  10. #9
    Senior Member TW_in_BC's Avatar
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    Quote Originally Posted by GlassAnkles View Post
    recessed side facing out is right. i just put on 15/49's and left those dumb locking tabs off. i used new shorter bolts with a little blue loctite to secure it.
    +1 for the Loc-tite. Those metal tabs are expensive for what they are! Use the GREEN Loc-tite if you're worried about disassembly, all you're doing is preventing that they don't vibrate loose.

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  11. #10
    Banned qwerty's Avatar
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    Green LocTite? All we can get is red, blue, and purple.




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