Results 1 to 11 of 11

Thread: Rear sprocket play

  1. #1
    Senior Member birdland's Avatar
    Join Date
    10.03.20
    Location
    Osoyoos B.C. Canada
    Posts
    500
    Thanks Thanks Given 
    457
    Thanks Thanks Received 
    160
    Thanked in
    103 Posts

    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

  2. #2
    Senior Member Alan F.'s Avatar
    Join Date
    06.01.20
    Location
    Haverhill, MA, USA
    Posts
    1,248
    Thanks Thanks Given 
    762
    Thanks Thanks Received 
    308
    Thanked in
    259 Posts
    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.
    Free Fork Swap & Upgrade info parked at: http://sites.google.com/site/alansdocuments/
    '65 CB160 https://tinyurl.com/Black-Friday-a-red-65-CB160
    CB250 Nighthawks 92,93,92
    SOHC CB750K 73, 78
    Boston,MA USA

  3. #3
    Senior Member WintrSol's Avatar
    Join Date
    06.02.20
    Location
    Florissant, MO
    Posts
    219
    Thanks Thanks Given 
    2
    Thanks Thanks Received 
    97
    Thanked in
    77 Posts
    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

  4. #4
    Benevolent Dictator ancientdad's Avatar
    Join Date
    05.21.20
    Location
    Nature Coast, FL
    Posts
    16,202
    Thanks Thanks Given 
    2,659
    Thanks Thanks Received 
    4,042
    Thanked in
    3,175 Posts
    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)

  5. #5
    Senior Member mike in idaho's Avatar
    Join Date
    06.17.20
    Location
    Orofino Idaho USA
    Posts
    863
    Thanks Thanks Given 
    1
    Thanks Thanks Received 
    278
    Thanked in
    243 Posts
    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
    '66 CB160
    '67 CL77
    '79 XS650
    '69 T100R
    '68 TR6R
    '69 T120R
    '72 750 Commando

  6. #6
    Senior Member birdland's Avatar
    Join Date
    10.03.20
    Location
    Osoyoos B.C. Canada
    Posts
    500
    Thanks Thanks Given 
    457
    Thanks Thanks Received 
    160
    Thanked in
    103 Posts

    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

  7. #7
    Administrator LongDistanceRider's Avatar
    Join Date
    05.22.20
    Location
    Vancouver, Washington USA
    Posts
    7,853
    Thanks Thanks Given 
    1,222
    Thanks Thanks Received 
    2,448
    Thanked in
    1,919 Posts
    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
    Contact: 408-239-9580 or [email protected]

  8. #8
    Senior Member birdland's Avatar
    Join Date
    10.03.20
    Location
    Osoyoos B.C. Canada
    Posts
    500
    Thanks Thanks Given 
    457
    Thanks Thanks Received 
    160
    Thanked in
    103 Posts
    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
    Join Date
    11.21.21
    Location
    Hagerstown MD USA
    Posts
    1,832
    Thanks Thanks Given 
    1,095
    Thanks Thanks Received 
    617
    Thanked in
    510 Posts
    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.

  10. #10
    Administrator LongDistanceRider's Avatar
    Join Date
    05.22.20
    Location
    Vancouver, Washington USA
    Posts
    7,853
    Thanks Thanks Given 
    1,222
    Thanks Thanks Received 
    2,448
    Thanked in
    1,919 Posts
    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 [email protected]

  11. #11
    Senior Member birdland's Avatar
    Join Date
    10.03.20
    Location
    Osoyoos B.C. Canada
    Posts
    500
    Thanks Thanks Given 
    457
    Thanks Thanks Received 
    160
    Thanked in
    103 Posts

    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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •