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Thread: Rear sprocket play

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    Senior Member birdland's Avatar
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    Rear sprocket play

    Another day, another job.

    Chain cleaning and tidying up the back end, I noticed play in the rear sprocket.

    https://imgur.com/a/TaFlKwB

    Is this normal? I've dismounted and mounted this wheel multiple times and I can't recall noticing any play here. The wheel bearing is 3500 miles old, solid and the wheel is in excellent shape.

    All the parts are there and on the proper sides/places as per FSM. Just wondering about the wheel damper bushings.

    I have a spare rear wheel (with a great spare sprocket), new spare bearings and bearing retainer, and if I need to go in, now's the time.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

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    Senior Member Alan F.'s Avatar
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    I understand that amount of play to be by design. To see something scary, put your bike up on the center stand, start the engine and engage first then 2nd gear. You'll see some serious sprocket movement then, but it's all normal and will work just fine.
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    Senior Member WintrSol's Avatar
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    Looks like the rubber bushings are somewhat loose, allowing the bolts to move more easily than some, but, given enough force, play is normal.
    ~1970 CB450 (junkyard dog), 1998 Valkyrie, black with lots of chrome

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    Benevolent Dictator ancientdad's Avatar
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    It doesn't look excessive, but you could take the big circlip off and remove the sprocket to see how things look. Sometimes the metal centers of the bushings will be a little loose in the rubber of the bushing itself. Looks like the studs/posts are tight in the sprocket.
    (move along, nothing to see here)

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    Senior Member mike in idaho's Avatar
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    If that was Mine, I would put a shim under the snap ring, to tighten things up a bit. That much movement is going to allow the sprocket to **** to one side under power, bending the chain links sideways and increasing the amount of wear on the ID of the sprocket hub. Everything lasts longer when the pieces stay in line.
    '66 CL160
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    Senior Member birdland's Avatar
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    Rear sprocket play




    Is it normal for these bushings to be easily removed? They are friction fit to the sockets but slipped out with the slightest resistance. Just a finger.

    They are in excellent shape - no deterioration and not at all malformed. They show no signs of wear and sit firmly with no wobble when seated.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

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    Administrator LongDistanceRider's Avatar
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    Those are press in and a booger to remove, never with wiggle and fingers.
    Jim O'Brien
    1979 CM400T aka the Roadbike, 1978 CB400T1 semi restored, 1972 CL350K4 restoration and the 1971 SL350K1 disaster zone.
    Plus 2 SL350K0's , 2 SL350K1's, 1 CL350K0 and 1 CL350K1 waiting for space and time
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    Senior Member birdland's Avatar
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    Quote Originally Posted by LongDistanceRider View Post
    Those are press in and a booger to remove, never with wiggle and fingers.
    Time to search out some replacements. I also saw a post about making a set from a/c hose.

    Onward…
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

  9. #9
    Senior Member ballbearian's Avatar
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    Why have they become loose? Some material loss, either the steel or the aluminum. 2nd question: do they have to be really tight? It's not like they hold the sprocket on. Why not clean them up and put back with some medium strength Locktite or even Hondabond? Probably too tight for aluminum can shims. Just trying to think of downsides if the bushings are priced like gold.

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    Administrator LongDistanceRider's Avatar
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    The bushings are for shock absorption of the sprocket to wheel on clutch engagement. I would use Loctite 648 to set them in place so there's no movement.
    Jim O'Brien
    1979 CM400T aka the Roadbike, 1978 CB400T1 semi restored, 1972 CL350K4 restoration and the 1971 SL350K1 disaster zone.
    Plus 2 SL350K0's , 2 SL350K1's, 1 CL350K0 and 1 CL350K1 waiting for space and time
    Contact: 408-239-9580 or longd[email protected]

  11. #11
    Senior Member birdland's Avatar
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    Rear sprocket play

    Good God. I found 5 nos on ebay for $40.00 USD total. Shipping is not ridiculous either.

    They're on the way.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

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    Senior Member birdland's Avatar
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    Yup - the outer casing of these bushings were left behind.




    Not a pretty or easy task to remove. I don’t have a suitable saw to get through the metal and collapse them - but they’re soft metal and bend in easily. I can’t imagine how hard this would be if you had to extract the entire bushing.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

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    Benevolent Dictator ancientdad's Avatar
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    The good news is you'll only have to do it once, the new ones will last longer than you and I will be around.
    (move along, nothing to see here)

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    Senior Member birdland's Avatar
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    Quote Originally Posted by ancientdad View Post
    The good news is you'll only have to do it once, the new ones will last longer than you and I will be around.
    Yup.


    I have told my kids - somebody needs to get licenced.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

  15. #15
    Senior Member crazypj's Avatar
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    That isn't abnormal but isn't right.
    It looks like aftermarket sprocket maybe?
    The original would have had a thin flanged bush inside bore but I've never seen an aftermarket sprocket with the bushing plus, the bore on that sprocket looks too small to fit one. The bush is only about 2mm wall thickness with flange maybe 0.75mm (It's a very long time since I made any)
    I don't remember the bushing ever being listed as a separate part either?
    I have made bushings for my 550F1 but that had around 60,000 miles on it at the time in early 1980's
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  16. #16
    Senior Member birdland's Avatar
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    Quote Originally Posted by crazypj View Post
    That isn't abnormal but isn't right.
    It looks like aftermarket sprocket maybe?
    The original would have had a thin flanged bush inside bore but I've never seen an aftermarket sprocket with the bushing plus, the bore on that sprocket looks too small to fit one. The bush is only about 2mm wall thickness with flange maybe 0.75mm (It's a very long time since I made any)
    I don't remember the bushing ever being listed as a separate part either?
    I have made bushings for my 550F1 but that had around 60,000 miles on it at the time in early 1980's
    I think it's perspective because of the camera angle. The sprocket that I'm using is OEM, as was one on the bike when purchased. Also - I have a spare rear wheel with a sprocket that is the same. All of them fit this wheel when the bushings were in.

    Now - the bushings? Don't know if they are OEM or not, but everything fits. Or would if they weren't in pieces.


    The bushings I've ordered are OEM. Should be good.
    '71'|74 CB450

    K4 Frame | K7 Engine

    Osoyoos, British Columbia

    Canada

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