Where to start with F4i fork settings? - Wrist Twisters
 
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post #1 of 12 Old 05-25-2014, 11:38 AM Thread Starter
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Where to start with F4i fork settings?

Well i am about to pop on my F4i forks i rebuilt with .90kg springs, new seals bushings and 5wt oil (as per racetech's site) and was wondering where i should start with the rebound and compression settings? Halfway between full hard and full soft?

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post #2 of 12 Old 05-25-2014, 12:36 PM
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Quote:
Originally Posted by nd4spdbh View Post
Well i am about to pop on my F4i forks i rebuilt with .90kg springs, new seals bushings and 5wt oil (as per racetech's site) and was wondering where i should start with the rebound and compression settings? Halfway between full hard and full soft?
stock valves and shims or racetech ?
stock would be 10 W

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post #3 of 12 Old 05-25-2014, 01:58 PM Thread Starter
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Stock valves. Race tech site indicates 5w for both the f4i and 919 forks. Honda OEM is something like 7or8 wt

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post #4 of 12 Old 05-25-2014, 02:14 PM
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post #5 of 12 Old 05-25-2014, 07:26 PM
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Go with 10wt.

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post #6 of 12 Old 05-25-2014, 10:04 PM
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I used 10 wt Maxima synthetic fluid & got great results.

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post #7 of 12 Old 05-26-2014, 09:27 AM Thread Starter
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Yeah I ran 10 in my 919 forks and liked it, thought I would try the recommended 5 in the f4i and see how it worked.

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post #8 of 12 Old 05-26-2014, 09:48 AM
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Quote:
Originally Posted by nd4spdbh View Post
Yeah I ran 10 in my 919 forks and liked it, thought I would try the recommended 5 in the f4i and see how it worked.
Perhaps for an F4i motorcycle Rectech's 5wt might make sense but for the 9er with F4i forks, 10wt probably would work better because of the additional weight. You can give it a try, if it sucks, draining old fluid & replacing it with new fluid is very easy on non-USD forks. You don't even need to take the forks off the bike.

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post #9 of 12 Old 05-26-2014, 05:10 PM Thread Starter
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Quote:
Originally Posted by arshishb View Post
Perhaps for an F4i motorcycle Rectech's 5wt might make sense but for the 9er with F4i forks, 10wt probably would work better because of the additional weight. You can give it a try, if it sucks, draining old fluid & replacing it with new fluid is very easy on non-USD forks. You don't even need to take the forks off the bike.
Racetech even recommends 5wt on the stock 919 forks.


Had her out today and i must say i was impressed with the stiffer springs and overall feel... i just set comp and rebound deadnuts center on their adjustment.

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post #10 of 12 Old 05-27-2014, 05:52 AM
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I tried US1 2.5/5 wt as an experiment, and stock 919 forks were instant pogo sticks.
USF05 is a 5 wt, but I never tried it.
Factory oil is 10 W.
USF05 in F4i or 919 forks can only do one thing, and that is reduce the high speed compression and rebound damping force by some degree, as well as changing the damping force curve shape.
2004 + 919 forks will allow for low speed damping force correction.
F4i forks will do that plus allow for low speed compression force correction.
Worth an experiment for those that want to.
In one likes the results, then it's A OK !

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post #11 of 12 Old 05-27-2014, 02:02 PM Thread Starter
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yeah we will see, that was my though, running the lighter weight oil but now i have control over rebound and compression so i can get some back if need be.

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post #12 of 12 Old 05-27-2014, 02:09 PM
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Quote:
Originally Posted by nd4spdbh View Post
yeah we will see, that was my though, running the lighter weight oil but now i have control over rebound and compression so i can get some back if need be.
Please let us know your findings.

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