Progressive or Stock Fork Springs - Revisited

[ragedigital]

A while back, I put up a photo of the springs that I took out of my FZR600 front forks. Those that looked stated that they were "stock".

Well, I just acquired another set, possibly 94ish, that I changed the oil and resold and they had a different spring. Here is a photo of the 2 springs. The top one is out of the (94?) forks I sold and the bottom are out of my 1996.

Any thoughts why they are different?

[yamaha_george]

A while back, I put up a photo of the springs that I took out of my FZR600 front forks. Those that looked stated that they were "stock".

Well, I just acquired another set, possibly 94ish, that I changed the oil and resold and they had a different spring. Here is a photo of the 2 springs. The top one is out of the (94?) forks I sold and the bottom are out of my 1996.

Any thoughts why they are different?

[

Rage,
Neither look to be linear wound as the original springs were made by Ohlins for yamaha if my information from Ohlins is to be believed.

The upper spring does look more linear and may be "sacked" out by wear but since it is the same length as the bottom spring I would tend to say nay to that also.

My new linears will be with me Monday / tuesday next week so I will post piccy of them and when I haul out my old springs I will post a piccy of those too with lengths which will give a better idea as to wear. that will not be until my PD valves from YSS arrive late next week early the week after (coming from Oz since the USA were being so bloody long winded with details )

New they should be 415mm long and less than 410 they are scrap metal I am by feel & gut reaction thinking mine are nearer to 400 so we will see some heavy close coiling on them .
Geo.

[ragedigital]

That why I'm wondering if one of them was made by Progressive since their springs are, well, progressive.

[mszilves]

That why I'm wondering if one of them was made by Progressive since their springs are, well, progressive.

If you take a test weight and put that on each spring (maybe have one kind of spring in each fork off the bike), if one is indeed a Progressive-brand spring and the other stock, the Progressive-brand aftermarket springs should not compress as much, as I believe they are definitely a higher spring rate than the stockers. A bit of work, but you may be able to get a better idea...

[ragedigital]

Not a bad call... unfortunately, I sold the other forks, so that springs went with them. I should have done that before I reassembled them.

[yamaha_george]

Not a bad call... unfortunately, I sold the other forks, so that springs went with them. I should have done that before I reassembled them.

Guys
I have my new linear springs
Picture at:-
http://www.saltmine.org.uk/kgb/catalogue.html

Prices and contact details there to if you need custom springs

or cannot put up with sales people jerking you around like wallet draggers et al