SOHC.co.uk Forums > CB500/550
550 K1 : up-shifting issues (mostly low RPMs)
Oddjob:
I would suggest checking the gear change mechanism behind the clutch basket, there are 2 hooks which catch the pins in the end of the gear selector drum, one pulls the pins and one pushes them. I suspect the pull one could be rounded off or be bent out of alignment. Also check the pins for any signs of damage just in case.
The kick we would probably describe as clutch snatch, this could be anything from a distorted clutch disc, a worm drive fault in the sprocket cover or even a broken clutch push rod, you’ll need to check everything as you take it apart. I’d also suggest checking the clutch basket to see if the large drive gear on the back has started to come loose or even if the internal damper rubbers are perished, see if you can find any movement in the gear whilst holding the basket firmly.
Erny:
Thanks, Ken, will check that
Erny:
After some time, I finally opened cluch cover (was first one opening it, BTW). Note: engine now has 19k miles from new
Winter was simply too cold to to motivate me doing it in cold garage, moreover I was lazy :D
Back to point - I tried to make few videos from my findings, please comment advice what is/can be wrong with regards to my up-shifting problem and clutch snatch/kick:
1. Clutch basket has serious axial play, I measured approx 0.7mm https://youtube.com/shorts/_LvZtXY1b3Y?feature=share and https://youtube.com/watch?v=o-TgZ4Vp3Ms&feature=share
2. Hooks on gear change mechanism seems to me Ok, see photos
3. Gear mechanism (wheel on shift drum stop?) has significant play but only in one direction, see https://youtube.com/shorts/Y626xFgk51w?feature=share - is that OK/normal?
4. Large drive gear is moving vs clutch basket, seems internal dumer rubbers are shot (can this cause clutch snatch/kick?) https://youtube.com/shorts/W4neSdbf_I4?feature=share
Other findings:
- clutch plates looks as new (friction ones has 2.68mm), no mechanical wear visible
- clutch collar and clutch basket bushing looks OK to me, but basket has some play (~0.3mm at the edge when trying to move left-right, up-down)
As I have shims from Ken, I can to fix axial play of basket.
Shall I replace damper rubbers too? If so, where to get them? What about shift drum stop wheel?
Any other ideas what I can check/do else?
My priority is to fix up-shifting issue..
Thanks
Oddjob:
The damping rubbers inside the basket look to be shot to me Erny. How do the towers look, where the tangs of the clutch plate sit are they still flat or are they showing ridges all up and down the towers.
Not sure on the gear selector wheel question, I'll need to compare with some of mine to see if mine do the same, never really looked at that before TBH.
I'd suggest looking for a replacement basket, new if possible. Or one that's got no play if not. Ask the seller to check.
Do the axial play when the new basket arrives.
I may have a 550 basket (not 500, they look the same but aren't) but it's the distance that kills it.
Hooks look ok. Have you checked the pins they engage with, might be a broken one.
Sesman:
The clutch has non serviceable Cush rubbers. Now I never new that!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version