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guy851
07-12-2007, 06:19 PM
Anybody good on this out there?

Where can I find spring tables? I looked at the Ohlins site and could not see anything.

I have a du8070 shock off a 91 SP
Spring numbers hard to read but look like 90-1083-28-00
or! 90-1033-29-00 but above looks closest.
4 threads visible above top preload locking ring. I wonder if this spring is anywhere near my weight, I think the rider weight range is quite wide on an Ohlins spring.. just have to try it.

So...where do I start
Sag should be fairly easy
But what base/start settings are recommended for compression and rebound adjusters?

Any thoughts welcome so I am not a mile off for the first run.

Thanks

Guy851

marvin
07-12-2007, 08:58 PM
According to my info. the DU807 should havve a 1095 spring. I can't identify your spring.

851/ 888 1989-93 DU 807 01095-39 110 110 110 115 115 120 120

Standard spring rate is a 110 which is really stiff. (like 888 SPO), I had a 100 spring and it was a bit too stiff, just put on a 95 and it's about right for a rider weight of 165-170 lbs with an aluminum subframe and carbon tail. My ohlins handbook suggest for starters, Rebound adjustment 15 clicks out, compression adjustment 14 clicks out. (just starting points)

Rick is our resident suspension guy, I will forward a link to him and see if he can answer your questions. give him a while because he is really busy right now.

NC Rick
07-13-2007, 10:33 AM
Sorry I am slow to respond to this...

Either of those numbers are not current from what I can tell in our Ohlins data.

The DU807 should take the 1095-xx spring, which is a 180mm long (uncompressed). I think the spring you have is a 90 N/mm or the art.# -29. If that IS the case, your set up for a light rider. On an 888 you would be set up too light according to Ohlins. That IS about the rate that Marvin prefers on his 851 but that bike is light at the rear with the aluminum subframe and carbon tail with no accessories. If your over 180, I would think you will want a firmer spring than that.

With regard to your settings, how long has it been since the shock was serviced? As the fluid degrades and even the gas charge goes down with time, these settings will change. Also without knowing your weight it is hard to point out a starting point. I would recommend starting with the bottom rebound clicker out by 17 clicks and the compression out by about 12-15 clicks if you are in the 160-175 range. Those are a recommended starting point based on several assumptions regarding you and your bike.

It is really important to keep your damper units maintained if you want to achieve a long life at top performance. The shocks are not expensive to have serviced, we charge $79 to do the service and many lower miles shocks take less than $20 or so in parts. If customers are keeping the shocks up by servicing them every year or so and within 10-15K miles, nothing but fluid may be needed. For a bit of insurance, we will often replace the shaft seal components (Quad-ring, anti-extrusion ring and dust seal) if the shock is old, has many miles or if we find much dirt packed in there. Those parts are only a few $ but give our customers a trouble free shock that will work through out the riding season. Traveling to a track day or a riding spot just to have the shock seal blow would not be a good thing.

You can have the Ohlins shocks serviced at many dealers all around the world.

I would start with 35-40 mm front sag and 30-35 mm rear sag. With the correct race sag set at the rear (rider and gear aboard) you should JUST see a little sag at the rear unladen. Just some sag would be 1-5mm. Anything far from this figure is an indicator of the wrong spring rate.

guy851
07-13-2007, 02:50 PM
For the help,

If I read the numbers on the spring with correct ones in mind it is easier to read 90-1095-29-00
Stamp at the top has a clear DU8070 and above that -943
bottom collar 629 01
Was fitted to a '91 888 SP

And will go on my Tricolore 851. Battery moved to the side but alloy subframe not fitted yet.

Seems like I might have to shed a little weight 170 but pushing 200 fully kitted up.

So a spring and service is on the cards. A little expensive to ship over to you so I better get this done here!

Next is to look into the terrible handling handling on my new '88 750 sport....back end feels like its bending its so soft. I will try a secondhand Showa unit off a later 750s/ss and see how that goes first.

Be Seen Red White and Green

marvin
07-13-2007, 10:23 PM
That is a 90n/mm spring. Probably a bit too soft. I am presently running a 95 which would be a bit better, a 100 would seem to me to be spot on, especially if it's a track bike. I just replaced my 100 with the 95. the 100 was ok but was a bit stiffer than my forks, totally balanced now with the 95. I have Race Tech .9 kg spring in the forks. My rear suspension rocker is the non adjustable type. If you have the adjustable you have a little more room to play with your spring rate.

scottieducati
04-03-2008, 02:44 PM
To carry this on a bit further, does anyone know what the stock spring rate is on the fully adjustable showa that came on the '92 851 strada bikes here in the US? Marvin?

marvin
04-03-2008, 02:49 PM
To carry this on a bit further, does anyone know what the stock spring rate is on the fully adjustable showa that came on the '92 851 strada bikes here in the US? Marvin?

Nope. the SPO Ohlins came with an 11.

scottieducati
04-03-2008, 02:51 PM
Marvin!! You must be getting old...

I said 1992 851!!!!! NOT 888 SPO...

BTW I'm looking for either N/mm of lb/in on the spring rate info for the SHOWA rear shock.

marvin
04-03-2008, 03:48 PM
Marvin!! You must be getting old...

I said 1992 851!!!!! NOT 888 SPO...

BTW I'm looking for either N/mm of lb/in on the spring rate info for the SHOWA rear shock.

Yes I am getting old, but I read your post just fine. The nope was the answer to your question, the SPO info. was for reference.

scottieducati
04-03-2008, 04:14 PM
Ahhhh says the blind man pissing into the wind :-p