SOHC.co.uk Forums > CB500/550
550 K1 : up-shifting issues (mostly low RPMs)
Erny:
--- Quote from: Oddjob on March 25, 2023, 12:37:13 AM ---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.
--- End quote ---
As for the basket - It is 550 one, I'll do detailed inspection today again, except dampers play, to me clutch really looks OK.
As for dampers - my fried was replacing these dampers on his 650 SOHC engine (shall have similar ones, I guess), he drilled rivets out, one guy made rubbers (from some plastic material) for him and then he used bolts to close it. And it is working well (racing engine).
Main question is if such axial play (0.7mm) could cause my up-shifting issues? Or that gear selector wheel ...
Need to inspect pins too that bolt hooks are engaging but I do not expect issue as up-shifting issue is on all gears and shifting works smooth w/o using clutch, will report anyway.
Erny:
With regards to basket axial play - just found that it is linked to collar length vs basket length - it is quite big to me (but maybe normal?). Only way to reduce it is to put shim under collar shoulder (between collar and basket), but Honda manual does not say a word about it, just mentions shims behind snap ring..
Any thoughts?
Video - I'm holding collar pushed firmly against engine - this is axial free play of basket (~0.7mm)
https://youtube.com/shorts/kOtujX2WB-I?feature=share
Erny:
Just to give you the update on this
Since last post I ordered few parts:
- shift drum stopper, neutral stopper and stopper cam plate replaced by new ones
- new clutch springs
- basket filed
- basket play adjusted (thanks to Oddjob's shim set!)
- assembled, new oil, filter etc
I did not do anything with dampers in clutch basket - I'll keep that for later (winter job, highly likely engine to be opened anyway for primary chain replacement at least)
First ride : up-shifting issue is still there, but I feel it less happening / reduced.
When testing shifting mechanism before assembly clutch and cover (with new replaced parts) I did this video to show the issue that I feel during shifting - when up-shifting, I usually cannot change gear unless I turn gearbox. Down-shift is always w/o issue. It is clearly visible in the video that when up-shifting, movement of gear drum is "stuck" in the midway and moves more when I turn gear (clutch basket shaft). This is exactly what I'm referring as my up-shifting issue.
https://youtube.com/shorts/G-AaCvEzcqE?feature=share
Question is if this is normal (so no more issue) or problem is in the gearbox itself? Maybe experts here (Bryan, Graham, Oddjob..) can comment?
Bryanj:
To engage gears with bike at stanstil and engine not running you need to rotate at least one shaft, maybe both, so the fact it baulks on changing on the bench is a "normal" occurance
Erny:
Thanks Bryan for this confirmation. Hope story is over now ;)
Navigation
[0] Message Index
[*] Previous page
Go to full version