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Have had my progressive springs in my front shocks for about 5 yrs now. Was just wondering if they have a service life and should they be replaced at some time??

Same thing with the 416's I have on the rear. Is there a point they just ware out??
 

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Do you have a compelling reason you're asking? Behaviour changes in your bike? Or did the 5th anniversary just come up and cause curiosity?
 

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Mostly because of the 5th anniversary.
 

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Coil springs can sag over time. If you're really on the ball, you'd have measured your suspension components and be able to track it.

With Jaguars, I see many that are over 20 years old, and somewhere around that mark some of the coil springs can sag a few mms and cause one to want to replace the springs.

So, yes - they can sag - typically takes a few decades with cars, and I don't really see it on bikes that often. I have seen lots and lots of 1984-1987 Goldwings with original springs from Mother Honda, and I doubt they've changed even 5 mm.
 

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it takes along time and alot of abuse for them to sag
 

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Took them out to do my bushings and seals today. They are still the 20.5 inches long Progressive says they should be. Did have an odd thing. the fork oil coming out of the left fork was totally disgusting, grey and thick, looked horrible (or as the British say "orrible") The fluid coming out of the right fork looked as clean as the new fluid I was putting in. And, the bottom 8mm bolt on the left side was totally seized, I had to drill out the old bolt head and install a new one. The new bolts look to be made from a different material then the old ones did. So I am hoping it wont happen again. I may remove them and put a bit of anti-seize on the copper washer.
 

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Good on you for doing one of the most oft overlooked parts of motorcycle maintenance.

The guys at RaceTech have me on schedule to bring them forks from the Trophy and the Goldwings in for at least an oil change every 20,000. For my track bike I do it every other year, as 20,000 doesn't come easy on that one. Every other year is about 2,500 miles on that bike.

And yep - it looks just 'orrible.
 

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I put progressive fork springs in my bike in February of '95. It had 112K miles on it. They still seem to be OK, but I haven't measured them for awhile. I'm pretty sure they have a lifetime guarantee against sacking.
 
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