SOHC.co.uk Forums > CB500/550

These cb550 K3 (uk) fork springs

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nairb:
I have had this cb550k3 from new......... so know its history.   The front end seems to be a bit spongy.  So I looked up the free spring lengths on the fork springs.  Then took one of the springs out and checked it.

The numbers for the spring length varied a bit from the various manuals.  From 443.5mm or 425.
Mine turned out to be 470mm.  Which was a surprise.
The spring :-
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Don't suppose anybody has checked their forks and has a spring length.  Maybe a thicker fork oil might help??.
I just thought they were getting a bit old after 45k miles
Ta
Nairb

deltarider:
Some owners, including me, have found out that the data concerning those springs in the Service Data section in the Honda Shop Manual are not correct. We have had several posts on this in the international forum. I would follow Honda's advice on fork oil though: 150-155cc of ATF. My springs have travelled 140.000lm and are still in excellent condition (and longer than in the Service Data).

McCabe-Thiele (Ted):
On my 500 K1 my front springs measured 445 mm in length, I looked at an old post where a service limit of 425 was mentioned, as you say hard to find reliable data.http://www.sohc.co.uk/index.php/topic,28909.0.html

Your 550 springs sound a good length at 470 mm, new oil of the correct volume might improve things without going for a heavier grade.

Oddjob:
Does it have a rebound spring fitted onto the damper rod?

3scs:
My K3 springs were 473mm

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