Replacing Fork Springs~ Which Fork Oil to Use Now?
Posted August 27, 2003 - 10:11 PM
Posted August 28, 2003 - 06:29 AM
Posted August 30, 2003 - 06:33 AM
Posted August 30, 2003 - 01:49 PM
We have in the past gone over this extensively.
Also try the YZF450 forum as well.
Posted September 01, 2003 - 02:50 PM
I went to my local dealer yesterday and talked with the service manager/head mechanic and he recommended using 20wt fork oil (BelRay I presume). I don't remember seeing a thread that mentioned using 20wt fork oil. Seems a little on the heavy side to me since most are using 5-7wt oils. He also claimed the stock oil was 10wt. I don't think the service manual states actual oil weight other than recommending the use of suspension oil "01". What is the true weight of "01" fork oil?
I am bumping up to 48 fork springs and thought I would inquire about fork oil brands, fork oil heights or fluid level cc's and accurate fork oil weights. Stay with stock fork oil and increase oil height? Stay with stock height and increase oil weight? Complete tear down necessary to remove all stock oil (as previously posted) or would a simple drain and refill be adequate? etc...etc...
Posted September 01, 2003 - 03:10 PM
It all depends on what you weigh and how you want it to preform. The thicker the weight oil the slower things will happen. What I mean is think or it like pushing veg oil or Syrup through a syrenge. the oil will move much quicker than the Syrup. You will want the one that will give you the best end result. To heavy and the fork will feel really slugish and harsh.
If you are putting 48's in you are either big or going big. If you are bottoming out then increase the oil hight, but you don't need to go heavier on the oil. Proper spring preload is also important for proper set up.
Presonally I would run 7.5-10 wt and think about increasing the oil height.
Posted September 01, 2003 - 06:46 PM
Posted September 02, 2003 - 09:51 AM
Posted September 03, 2003 - 03:03 AM
it still lacks accurate information and opinions seems to vary
You will find as many opinions on fork oil as engine oil.
The rule of thumb, in this case (which REALLY should be a surprise - for once) is the more expensive the oil, the better it is.
The reputational rebuild shops use either Spectro, Pro Circuit, Showa, KYB 01, Race Tech or some derivation of each. Many have SWORN the KYB 01 gave the most supple performance (don't read this as BOTTOMING).
And KYB is at the top of the heap $$$ wise.
I personally wouldn't use the conventional oils in my conventional forks (Honda CB750 Nighthawk w/ Race Tech's Cartridge Emulators, or my little 2003 TTR 125LE)
Also, I do BELIEVE and DO CORRECT me if I am wrong, is the KYB and Showa SS is 5#...I think.
In either MXA or Dirt Rider a while ago, they talked of oil. That is where I recall "if my memory serves me right (Judge!)" it said it was, the KYB amd Showa SS was 5#.
BTW, there ARE two grades of Showa SS. THe other is 7# I believe.
If you are respringing w/ NO REVALVE, you will more than likely need heavier oil.
Posted September 03, 2003 - 05:58 PM