What fork oil quanties do you use?

motoddrob

motoddrob

Hero member
Location
S/W Australia
Just re-assembling my Marzo forks, have Race Tech springs and Gold Valves and using 15wt oil. What are the different opinions regarding oil levels? Do you add a measured quantity or fill to a measured depth from the top of the stanchion?
Rob
 
I assume we are talking 38mm Marzocchis, not M1R, right?

I think (!!) to remember, that 170mm distance from top (compressed, springs out) equals to roughly 230ml and 140mm from top roughly to 270ml, but that is without guarantee!!

For M1R it is more in the range of 350 - 400ml per side.
 
Rob, I am wondering about the oil weight. In the past I have used Race Tech springs and valves. They have supplied me with their oil. They said to mix the 5 weight with the 10 weight and get to a 7.5 weight.
Isn't 15w too thick?

Myke
 
rob, like vince i generally run about 130mm from the top, springs out, fork compressed
i also use race-tech 15w in my own 1200
its set up for touring with the extra weight of bags etc
turns out same setup works very well for very spirited back road riding or track days
but is a bit stiff for a leisurely solo ride

i'm using .85kg r-t springs. preload is a little more than 30mm as i recall.
blue springs @ 3 turns on the emulator. two slow speed bleed holes in emulator

myke the oil weight controls rebound. if i set mine up for general solo riding
i'd drop to a .80kg spring (i'm not a heavy guy) two turns on the emulator spring and 10w oil
load and riding style/use dictates how to best set them up for the pilot
adjustments are easy with clip ons  :D

 
Rob, my set up is almost identical to Scotts.  When I had the forks done at Racetech I had them set it up for Track days which was a mistake as I ride a lot more on the street than I do on the track (once in the past 3 years).
    Track set up as supplied by Racetech
  .95kg/mm springs
  10mm preload
  Racetech own ultra slick oil#3  (15w)
  Oil level is measured from the top with springs out emulators in (it does make a difference)forks compressed , oil level should be=100mm, 
  if you pull out the emulators the level drops to 130mm.  The race set up was way to harsh for the street.

        The set up I have now is pretty much the same as Scotts
            .85kg/mm springs
            20mm preload
            Ultra slick #2  (10w)
            Emulator 2 turns
            Oil is 100mm from the top.  This set up works good for me If I ever get another track day in I would take the .95 springs with me and experiment , easy to change with clip- ons not so much with the adjustable? bars,  Cheers Dave
       
 
Jotacorsa, I agree. That is why i was questioning using a 15W oil. I weight 200 pounds and race tech was rather clear the  7.5 W was the most I should go with.
 
Hi all,
The Race Tech springs and emulators have been in the forks for over 10 years now, can't remember what the spring weight is but I do remember setting the emulators at 2 turns.
Need to look in my archives to find the original receipt for the springs I guess.
Have always used 15wt oil, I'm a spirited rider and like the suspension firm.
Just found the old receipt, doesn't say what spring rate they are but the numbers are FRSP 323495. Maybe I need to look at the RT site.
I'll go with the 130mm level
Thanks guys
 
When I had the Teflon sealing rings added to the outside of the emulators,snug to the inner legs and forces all the oil through the emulators they said 15wt,from my experience thats to slow,hard,so I asked for 7.5 and they said If the fork kicks up to much on multiple bumps under brakes up the oil weight.Thats sounds like a condition called Packing,thats when the fork cannot react fast enough to a series of high speed bumps,thats fork travel speed.I would have thought lighter oil would speed up the reaction time.Sometimes you just have to do what you expect will work and try it,I am happy with the suspension,definition,don't notice anything obvious on the goat tracks around here at my usual goat track travelling speed,not supper high or low,nice and comfy even.
 
Hi Dave, new springs, can't afford em after having to buy new Ceriani yokes :o So heavy springs it is, besides they have been in there for 50k kays.
Assembled the forks today, new stanchions, yokes and seals, legs nicely polished.
The preload was set at 20mm so I'll make a couple of 10mm spacers.

Also caught up with JC last w/e for the Northcliffe run. He and another 5 sidecars and 2 solos turned up at my place on Friday and I led them on a long around about route to Northcliffe, 170kays and only 4 kays of bitumen. 4 beer stops along the way so it took a few hours. JC's 3c sidecar was popping on over run, probably loose exhaust nuts he reckons as he'd fitted new seals. Top ride on the GS too. Big night at the pub!!
 
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