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Its fork rebuild Time...Need some advanced questions answered

Started by EEL, February 23, 2011, 07:03:32 AM

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EEL

February 23, 2011, 07:03:32 AM Last Edit: February 23, 2011, 07:09:30 AM by EEL
Finally blew a fork seal.. Need a couple of questions answered

I have 2003 M1000 adjustable showas on my bike

1) Whats the oil level measurement in mm from top of fork
2) Its it with the fork compressed?
3) Does the spring need to be installed before measuring the fork oil level?

I have a fork oil level tool so and I know its 7.5wt oil for my fork. Just cant remember the above.

Thanks in advance

Speeddog

#1
February 23, 2011, 08:42:52 AM
Make sure to clean the sliders and wet-sand the dings with 1200 paper and WD-40 so the new seals will live longer.

1) 120mm is a good start.
2) Yes, fork compressed.
3) No spring for oil level.
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

EEL

#2
February 23, 2011, 04:29:14 PM
So..this is where I get confused. It seems like they keep changing the spec on us. I was able to look at a factory chart from today when I boughy my fork seals and it say 95mm from top for the M1000. Thats a lot stiffer than 120mm. When I look at the S2R1000 service manual and it says 105mm from top.

What the hell! Arent these all the same fork?

ducpainter

#3
February 23, 2011, 05:38:02 PM
Quote from: EEL on February 23, 2011, 04:29:14 PM
So..this is where I get confused. It seems like they keep changing the spec on us. I was able to look at a factory chart from today when I boughy my fork seals and it say 95mm from top for the M1000. Thats a lot stiffer than 120mm. When I look at the S2R1000 service manual and it says 105mm from top.

What the hell! Arent these all the same fork?
They play with the oil level to avoid bottoming with light springs.

If your bike is sprung correctly for your weight you need less oil.

trust Speeddog.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#4
February 23, 2011, 06:07:41 PM
Shoulda asked before.... what springs do you have, and how much do you weigh?
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

EEL

#5
February 23, 2011, 06:21:47 PM
stock m1000 springs (They are progressive). I weigh 175 w/ gear. I've heard that most bikes are springed stock for 150.

Not sure if it matters but i've probably got about the same amount of weight pulled off from the bike from all the mods.
Wondering if its a wash.

ducpainter

#6
February 23, 2011, 06:23:31 PM
Not if you have clip ons.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


ducpainter

#8
February 23, 2011, 06:33:41 PM
Quote from: EEL on February 23, 2011, 06:26:21 PM
No clipons.
Have you ever checked sag?
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


EEL

#9
February 23, 2011, 06:36:43 PM
Not in a long time. But doesnt sag change w/ fork oil level and preload? . How does that help me set the oil level in the fork?

ducpainter

#10
February 23, 2011, 06:58:56 PM
Quote from: EEL on February 23, 2011, 06:36:43 PM
Not in a long time. But doesnt sag change w/ fork oil level and preload? . How does that help me set the oil level in the fork?
Sag does not change with oil level. It will change with preload.

What we're trying to determine is if you have the correct springs for your weight. If you do then you can safely use the oil level Speeddog gave you.

If you don't, then a lower oil level may cause you to bottom out. If you have a lot of preload on the springs the bike will ride harshly regardless of oil level.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#11
February 23, 2011, 07:06:27 PM
I've got a set of used S4 springs that would be quite a bit better for ya than those stock dual-rate jobbies.
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

EEL

#12
February 23, 2011, 10:05:49 PM
Dont have the bucks for that right now. But i've never bottomed out on the fork yet and ( my zip tie tells me I have about an inch at the bottom) Preload is pretty weak actually. I have about 4 lines showing.

ducpainter

#13
February 24, 2011, 04:06:54 AM
Quote from: EEL on February 23, 2011, 10:05:49 PM
Dont have the bucks for that right now. But i've never bottomed out on the fork yet and ( my zip tie tells me I have about an inch at the bottom) Preload is pretty weak actually. I have about 4 lines showing.
What is your sag number?

You'll never get closer to the bottom of the travel than that with the stock oil level.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


EEL

#14
February 24, 2011, 05:21:34 AM
I'll measure and get back to you guys.
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