suspension question - Wrist Twisters
 
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post #1 of 9 Old 05-27-2014, 10:13 PM Thread Starter
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suspension question

hello to y'all,
here the Q,
I've bought a used set of f4i forks and everything else that needs to be bought to do a full refurbish, but I'm not gonna buy race tech spring prior verifying with you guys can i run stock 03 919 springs in f4i forks
please feel free commenting and advising...
thanks in advance!

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post #2 of 9 Old 05-27-2014, 10:30 PM
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Why would you want to run crap stock springs?

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post #3 of 9 Old 05-28-2014, 12:21 AM Thread Starter
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out of technical/mechanical curiosity...i couldn't measurements and specs for both, to compare them...
so yeah, if anybody knows...

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post #4 of 9 Old 05-28-2014, 05:37 AM
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They will fit, but you'll likely need to adjust the spacer length to get the preload correct. As Oak was alluding to, however, you'll get the most benefit by getting the proper springs for your weight.

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post #5 of 9 Old 05-28-2014, 02:35 PM
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yeah do yourself a favor and get the racetech springs.... if your going to pull the forks completely apart to rebuild em, may as well do the springs as well. Just went with some .9k g springs in my F4i forks with 5wt oil, seems to work well.

I pulled the original spring and spacer out and cut the racetech spring / spacer so they were the same length, this gives you right at the recomended 10mm of preload when the preload adjuster backed all the way out.

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post #6 of 9 Old 05-28-2014, 04:04 PM Thread Starter
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so i will need to cut the race tech springs in order to fit them into f4i forks?!
i guess i will do that

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post #7 of 9 Old 05-28-2014, 04:22 PM
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No, the springs don't get cut. Actually, the Racetech springs for the f4i and 919 forks are the same. They will come with spacer material (aluminum tubing I think). You'll need to get some measurements, then cut the spacers such that the springs are compressed ~15mm (with preload backed completely out) when the forks are assembled. There are more detailed instructions that come with the springs, and there are threads available on this subject as well that give the finer details.

Edit: I think there is a range of acceptable preload. I just threw 15mm out there based on other suggestions made on this forum.

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post #8 of 9 Old 05-28-2014, 05:35 PM
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Just match the stock spring + spacer length with the racetech spring + spacer length, this will get you 10mm of preload like racetech wants.

And yes you get a piece of aluminum tube you cut to the length you want... for me the racetech springs were shorter than the stock f4i, so i needed to cut a longer spacer.

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post #9 of 9 Old 05-28-2014, 06:30 PM Thread Starter
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thanks for the info,,,
ill keep you posted

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