brake from f4i on 919 - Wrist Twisters
 
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post #1 of 16 Old 07-15-2007, 08:56 AM Thread Starter
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brake from f4i on 919

Hello all i'm new to all this 919 stuff, due to new laws in PQ my 1000rr would cost 1500$ a year in registration alone so sold it and now have a nice 919 . I have have bought on ebay some f4i forks wanted to know if the fender is the same and if the brake from the f4i are an upgrade from the 919's or are they the same. thx

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post #2 of 16 Old 07-15-2007, 09:41 AM
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I started a thread on the caliper swap subject (see "future caliper swap") and it appears the F4i calipers actually are an upgrade -- they bolt right on, the pistons are larger, and the pads have about 20% more area, which will result in stronger brakes. While you may be able to use the original 919 master, with OEM pads the brakes will probably be too grabby, so it may be wise to fit a 16mm or 18mm master to make things more predictable. As for the F4i fender, I don't think it is a direct bolt on, but check for threads on this subject to be sure.
Welcome to the 919 fold, and keep in touch.

Rob

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post #3 of 16 Old 07-15-2007, 09:51 AM Thread Starter
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thx Rob does that mean I cant use the 919 fender with the f4i forks?

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post #4 of 16 Old 07-15-2007, 09:53 AM
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Correct. You'll need the F4i fender.

2002 919 40,000 miles
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post #5 of 16 Old 07-16-2007, 06:18 AM
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Why would you want stronger brakes? My brakes grab enough to lock up very easily.

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post #6 of 16 Old 07-16-2007, 08:29 AM
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Quote:
Originally Posted by HondaStreetfigh View Post
Why would you want stronger brakes? My brakes grab enough to lock up very easily.
+1 Stainless lines would be a smarter upgrade.

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post #7 of 16 Old 07-16-2007, 08:32 AM
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Quote:
Originally Posted by Bock919 View Post
+1 Stainless lines would be a smarter upgrade.
+1 I have the Galfers. I love em. Look great, and after a little practice (especially on the rear brake) you don't lock em up, but have great feel on your braking.

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post #8 of 16 Old 07-16-2007, 06:51 PM Thread Starter
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i've got the galfers on and have some SS lines but i'm a little heavy so need more power......

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post #9 of 16 Old 07-16-2007, 07:02 PM
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I could be wrong about this, but I'm pretty sure your tires are going to be the limit to your stopping power if you're running street tires on your bike. Hey, I been wrong before, why stop now?

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post #10 of 16 Old 07-17-2007, 09:39 PM
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Brake swap

My brakes have more stop,then I have nerve.
I went from ZRX1100, to Concours, and then to 919, so I'm still noticing a huge difference in performance.
Especielly since it's been raining every day since I brought it home.

[
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post #11 of 16 Old 05-02-2010, 08:29 PM
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RESURECTION time!

i was just pondering putting a set of f4i calipers on because of the larger piston diameter and i understand the logic behind doing the master as well. But does this even make sense?

I was thinking the larger piston would be easier to control in a oh shit moment and 20 percent more pad cant be wrong. but would this be a upgrade worth dorkin with? Ive got SS lines and loved the upgrade there.

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post #12 of 16 Old 05-02-2010, 09:33 PM
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honestly i dont see why you would need more than the original calipers.... i run complete stock setup stock lines (ya i kno i kno) and it provides great feel and grab... i have NO problem pullin 25mph stoppies, never had any problems with them fading and i can lock the front up when ever... and this is with a super sticky pilot road 2 at 32 psi.

a question tho... is the stock master cylinder smaller... so when using the larger piston calipers you have WAY to much mechanical advantage.

i guess i could see how you could want a little more braking power but i run my 919 pretty damn hard and have NEVER felt that it needed more braking power.

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post #13 of 16 Old 05-03-2010, 08:39 AM
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Yes the stock master is smaller on the 919 so you would want to use a f4i master as well but I was just wondering if there would be a benifit in doing this. the 9er brakes stop it fine but better is always better...

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post #14 of 16 Old 05-03-2010, 10:10 AM
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it depends on what you want IMO. i personally dont think that the 919 is anywhere lacking on braking power, i know my CRF250's stock front disk setup quickly becomes overworked when your hard on it in the street... in the dirt where it should be it never overheats.

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post #15 of 16 Old 05-03-2010, 12:39 PM
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Well my 9er is pretty modded and basically I'm looking for what to do next, i perfer functional mods for the most part. the brakes are fine as is but if i can improve them and not have it cost a arm and a leg I'm on it!

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post #16 of 16 Old 05-03-2010, 01:49 PM
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Quote:
Originally Posted by brian View Post
Well my 9er is pretty modded and basically I'm looking for what to do next, i perfer functional mods for the most part. the brakes are fine as is but if i can improve them and not have it cost a arm and a leg I'm on it!
i dont see why it would be a problem... if you can find the f4i calipers for cheap go for it. Try it with the stock master and if its too touchy get a bigger one.

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