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Old 04-12-2015, 09:39 AM   #1
ctfz1 OP
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YSS FORK VALVES (Ricors/Racetech ~?)

Anyone familiar with these. Posted in Equipment, no response.
http://www.yssusa.com/products_PDValveList.html#BMW

Would like to do my 81 fork. Still getting the bike going so gathering information.
Mixed feelings. OEM 37mm fork (XV920RH), certainly could use help.
Cost wise, since going with a wider rim 18 inch front wheel is recommended, have to think about a possible fork swap vs valve improvement.

So anyone used these? YSS PD Fork Valves?
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Old 04-13-2015, 08:38 AM   #2
chasbmw
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My experience with the very similar Racetech valves on ATE forks is that they are sold as a one size fits all kit and my experience with the Racetech suggested settings was that they were plain wrong......

This does mean that you will have to play with all the variables such as fork spring weight and preload, valve spring weight and preload, oil weight and volume.....that's a lot of variables and I gave up without finding any set up that worked well enough to suit me throughout the range of action.

Your experience may differ.

I'm not why you want to go with a wider 18" rim and tyre, one of the secrets to a fine handling twinshock airhead is the use of standard 3.25" and 4.00 MODERN tyres.
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Old 04-13-2015, 11:55 AM   #3
ctfz1 OP
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some confusion

I am restreeting an XV920RH Yamaha that has been a while sitting sort of on the cheap.
I am familiar with Racetech by reputation.
There is some information for setting up the Gold Valves for European TR1 (euro version XV920R).
Anyway reading about Ricors on BMWs has stirred my interest. Ricors does not make anything for 37mm forks.
I was wondering if YSS PD Valves were closer to Racetech or Ricors. IE very tuneable with knowledge or fairly good as purchased.

I am almost to start and ride point (hopefully). If the engine proves good, seat is next project.
But..
I expect to enjoy the bike but my back would appreciate a better than 1981 street fork. So thinking alternatives.
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Old 04-13-2015, 07:23 PM   #4
k-moe
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Quote:
Originally Posted by ctfz1 View Post
I expect to enjoy the bike but my back would appreciate a better than 1981 street fork. So thinking alternatives.
The forks are actually pretty good for what they are. It's the rear shock that will make your back hurt. They came undersprung, and about 1/2 of the travel gets used up by the rider's weight.
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Old 04-13-2015, 07:53 PM   #5
ctfz1 OP
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rear shock

TR1.de recommends 1980s XT600 rear shocks as a replacement improvement on a small budget.
Intended as old one has 40,000 miles.
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Old 04-14-2015, 09:21 AM   #6
Euromad
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I had little trouble setting up my race techs. They are the same idea as the YSS. I went through a suspension place that gave me much of the settings, oil volume, etc. The YSS's ae a little cheaper I used Thor Lawson who does vintage suspension and bought race tech.
Brand Model Year
YSS PD Fork Valve No.
Oil (SAE) Oil Level OD.
























































































































YAMAHAXV 920 = Virago81-8226515w
37C
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Old 04-15-2015, 07:36 PM   #7
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Cogent has the ddc valve that works nice. You can send him your forks and he'll tune them in on the dyno. I've been impressed with them so far.


Motocd.com
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