F3-800 front forks Q - MVAgusta.net
 
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post #1 of 8 (permalink) Old 08-06-2016, 09:27 AM Thread Starter
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F3-800 front forks Q

What is the min distance that these forks can have showing on the stantion before it bottoms out?
On the R1, for example the part of the fork fastened to the triple clamp would bottom out when it was, well, at the bottom.

Is that the case with these forks too?
Trying to measure how much to leave before bottoming out (i.e. setting the front pre-load).
If they bottom out where every other fork does, then I'm fine, but if they leave a gap - then possibly not.

M

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post #2 of 8 (permalink) Old 08-06-2016, 05:19 PM
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You should be setting sag with preload...not where the fork bottoms out.
If, with proper sag, the fork bottoms under heavy braking, then you need a higher spring rate.

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post #3 of 8 (permalink) Old 08-06-2016, 06:08 PM Thread Starter
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Originally Posted by silentservice703 View Post
You should be setting sag with preload...not where the fork bottoms out.
If, with proper sag, the fork bottoms under heavy braking, then you need a higher spring rate.
With my forks, I've always set the preload by putting a cable tie round the forks and then riding hard - and leaving 10mm extra travel.
But either way - I could do with knowing where the forks bottom out - so I can either change preload or spring rate.

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F3-800 / RVF400. Lancashire, England.
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post #4 of 8 (permalink) Old 08-06-2016, 06:10 PM Thread Starter
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I've used this as a guide for suspension setup for the past 18yrs.
http://bert.hollingside.com/temp/f3/...nsionSetup.pdf

Take a chance while you still got the choice.
F3-800 / RVF400. Lancashire, England.
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post #5 of 8 (permalink) Old 08-06-2016, 08:24 PM
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If you can't get the correct Sag figures then you don't have the correct spring rate, your Sag measurements will tell you this one way or another, it's that simple.
However, if you have the correct spring rate but badly set up compression damping, then your forks could bottom out regardless of how you set the pre-load.

Keen to hear how you're doing the rear?

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Last edited by Donsy; 08-06-2016 at 08:27 PM.
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post #6 of 8 (permalink) Old 08-08-2016, 12:18 PM
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Quote:
Originally Posted by Donsy View Post
If you can't get the correct Sag figures then you don't have the correct spring rate, your Sag measurements will tell you this one way or another, it's that simple.
However, if you have the correct spring rate but badly set up compression damping, then your forks could bottom out regardless of how you set the pre-load.

Keen to hear how you're doing the rear?
Exactly my problem with the compression damping. I can get the sag set properly but I am bottoming out under heavy braking. I had a suspension tuner look at it and he was shocked how little compression damping my forks have available. I will be going to cartridge kit this winter. Until then, I added more preload to compensate, which is just a bad band-aid fix.

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post #7 of 8 (permalink) Old 08-08-2016, 04:57 PM Thread Starter
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Quote:
Originally Posted by Donsy View Post
If you can't get the correct Sag figures then you don't have the correct spring rate, your Sag measurements will tell you this one way or another, it's that simple.
However, if you have the correct spring rate but badly set up compression damping, then your forks could bottom out regardless of how you set the pre-load.

Keen to hear how you're doing the rear?
Doing the rear the standard way - set the sag at around 35mm. The compression and rebound to suit.

Take a chance while you still got the choice.
F3-800 / RVF400. Lancashire, England.
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post #8 of 8 (permalink) Old 08-08-2016, 07:06 PM
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Quote:
Originally Posted by nk140 View Post
Exactly my problem with the compression damping. I can get the sag set properly but I am bottoming out under heavy braking. I had a suspension tuner look at it and he was shocked how little compression damping my forks have available. I will be going to cartridge kit this winter. Until then, I added more preload to compensate, which is just a bad band-aid fix.
That's correct.

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