SOHC.co.uk Forums > CB500/550

Front end bouncy

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DomP:
The forks on my cb550 have a fairly horrible rhythmic bounce at around 40-45 mph, my initial suspicion was the front wheel being out of balance so removed it and balanced it as I'd not bothered doing it when I rebuilt it.  It was quite out so I thought I'd solved the problem, wheel back on and a ride out has shown I'm barking up the wrong tree.  Has any one got any thoughts or ideas as to what may be the issue?

 Forks have been fully refreshed with I believe 7.5 or 10wt fork oil and a small preloaded spacer added (tried removing spacers, no change) 

Bryanj:
Too much oil or too heavy oil

DomP:
Oh ok Bryan, I think it was probably 10 wt in reality, I put in the specified quality and measured the height but it was a while ago now.  Shall I drain it and refill with ATF?

Has anyone on here tried Yss Emulators in these forks?

Murf:
Is the tyre old, is the tyre fitted to the rim  evenly all the way around. Are the rear shocks ok. Has the tyre ever had that tyre slime stuff put in it.  Is the tyre a reasonable brand, do the sliders move up and down freely.  Is the inner tube new or old. Is there play in bushes in the sliders. Is the brake binding or disk warped.

DomP:
Its a  new Avon tyre, no brake binding and forks moving as they should. I will check the rim fitment today, its the only thing ive not thought to check

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