SOHC.co.uk Forums > CB350/400
Play in my driving sprocket
Athame57:
I went to check my chain tension, that was fine but other sniffing around had me find play in my rear final drive sprocket. The four securing nuts are good and tight and the retaining circlip is in position, no play in the wheel either.
Before I pull everything apart though, will this be down to the damper bushes being worn out? :-\
K2-K6:
Sounds like rotating play you're feeling there ?
If so, then it's the gear dog engagement you'll feel initially and above all other movements in that plane.
Visually, the dogs are like castelation (think Castle turret) with two sets opposing each other, to be moved into "mesh" intertwined in carrying the drive torque from one neighbouring gear to another on the same shaft ... all moved as you change gear.
There MUST be slack in their form to allow them to easily engage on request, else you'd need the accuracy of William Tell to fire them in between each other.
Essentially, fairly crude in arrangement with the slack you can feel if rocked back and forth.
Technically these are a "constant mesh, dog engagement" gearbox design as are most bikes. It's the dogs you hear clattering in partially missed gear change is made, and not gear teeth as such. Pretty tough life, the dog's life in a gearbox
Oddjob:
Reading that I got the impression he was feeling front to back motion in the rear sprocket not the front, hence the reference to 4 nuts, only 2 on the front sprocket.
If so, the damper rubbers may have gone hard and need replacing.
Athame57:
--- Quote from: Oddjob on May 12, 2025, 12:40:04 PM ---Reading that I got the impression he was feeling front to back motion in the rear sprocket not the front, hence the reference to 4 nuts, only 2 on the front sprocket.
If so, the damper rubbers may have gone hard and need replacing.
--- End quote ---
Yes, it is rear sprocket.
K2-K6:
I was going to say, I think you're right Ken :)
Yep, rear cush drive rubber suspect then.
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