SOHC.co.uk Forums > CB500/550

These cb550 K3 (uk) fork springs

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Oddjob:
Measurement clearly shows they are 480mm approx not 470mm. They are supposedly the same springs as the 550f2 and those off my 550f2 are 502mm long. There are some nos ones on eBay maybe ask them for a length check?

nairb:

--- Quote from: Oddjob on January 13, 2025, 12:12:12 PM ---Does it have a rebound spring fitted onto the damper rod?

--- End quote ---
Now I thought this was going to be a simple/quick job.... I did rebuild these forks ages ago to replace the fork seals. I dont remember now if they have "rebound springs" but if they do, they are cheap from DSS. 
Some of the new springs on ebay suggest a spring length of 485mm.

I am going to take the forks off and pull apart to check both springs and check for rebound springs. I can then check all is correct.
It is winter, and it's the sort of thing we are supposed to be doing.

Can springs retain their length but become weaker??.  Dunno.
I will report back
Nairb

McCabe-Thiele (Ted):
As regards keeping length yet becoming weaker in operation the manuals appear to indicate that there is a minimum length for service/replacement so there must be a connection between length & overall performance.

I would definitely look at replacement springs if there was vissible corrosion even if the length was within the service limits.
My 500 springs had been fitted with pre-load spacers, when I removed the spacers that I did not re-fit the spring length was still within limits.

On my 400 the front end felt much better after I carried out an oil change even though I used the standard grade fork oil. I did underfill the level by 25 ml due to not knowing the correct amount. One of my winter tasks when it's a tad warmer is to top them up though it's not as bad as overfilling I believe.

When you drain your fork oil it might be worth checking if the volume is the same on each side as well as the more obvious colour/condition of the old oil.

My Haynes Superdream manual shows ATF for the forks!

nairb:
Well, having pulled the r/h fork apart, all seems to be present and in-place.  Including the rebound spring!.  Will check the L/H one next and check the spring lengths in that one.  Wonder if there will be a difference between legs.

The r/h set:
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At least I will make sure the oil levels are the same in each leg.

DomP:
Rebound springs? My 550F doesn't have rebound springs, is that just a K3 thing

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