Front fork spring noise in fork tubes - Page 2 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #11 of 24 (permalink) Old 09-20-2017, 12:59 AM
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Originally Posted by HFJeff View Post
I think I narrowed this down. It does appear to be the front pads rattling around in the calipers and against the rotors on bumpy roads. I can't believe I didn't figure it out sooner, but I was almost positive it was the front fork springs slapping the sides of the fork tubes-it certainly sounded like it. I started applying the front brake lightly while coasting on bumpy roads and the sound went away. A silly concern but it sure bugged me. Thanks all for the help and suggestions. Case Closed!
If you apply some copper slip to the edges of the pads where they sit in the callipers it will help to quieten it down a bit.

Glad you sorted it - nothing worse than a noise you cant locate.

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post #12 of 24 (permalink) Old 12-01-2017, 11:18 AM
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Sometime in the last year while trying to "set up" my suspension, I changed the "preload" on the front forks from 1 line to 3 lines. I don't remember when and I didn't keep records at that time, though I do now.

Lately, when I hit a small pothole at slow to medium speeds, here has been a "clicking"?,"knocking"? "tapping"? sound that came from the inside of my front forks, that drove me nuts.

I would make a mental note about it while riding but my brain has a large "circular file" in it and nothing ever got done.

This morning while reading the suspension info Ray has documented for us I decided to check my "settings".

As I checked my SAG I noticed that the clunk sound was there every time I pushed the front forks down and they rebounded, and that my "preload" was now at 3 lines, not the 1 line that was in my notes.

So I tightened up the "preload" to one line, and behold, the "knocking" went away. I haven't ridden it yet since it is raining, but I am pretty sure I am not going to be bothered by this again.

I am curious if this is the "clunk" that many people have been complaining about for a while on this forum.

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post #13 of 24 (permalink) Old 12-01-2017, 11:28 AM
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Phil, If one still has the original springs in a Gen1 or 2, there is very little preload at the "standard" settings, and of all the forks I have rebuilt, it still surprises me how many ride with so little preload in what are generally considered "undersprung" forks for anybody over ~160-170 lbs. Not surprising the noise that will result.

At minimum, with all lines showing, the springs should have about 15mm of preload (the amount you'd have to compress to put the fork caps on).... they don't usually have any, so you have to dial them up as you have. Each line is ~5mm.

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post #14 of 24 (permalink) Old 12-01-2017, 02:35 PM
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Phil, If one still has the original springs in a Gen1 or 2, there is very little preload at the "standard" settings, and of all the forks I have rebuilt, it still surprises me how many ride with so little preload in what are generally considered "undersprung" forks for anybody over ~160-170 lbs. Not surprising the noise that will result.

At minimum, with all lines showing, the springs should have about 15mm of preload (the amount you'd have to compress to put the fork caps on).... they don't usually have any, so you have to dial them up as you have. Each line is ~5mm.
Perhaps a person should add a washer or two to the spacer in order to start out at the right point? I didn't know about this the last time I changed the fork oil so I didn't look to see if the fork cap touched the spring when I started to screw the cap on.

On my old FZX700 everyone said to make longer spacers to set the "sag" a little higher. Boy was it a hoot to try to hold that cap straight while compressing the spring, and NOT to crossthread the darn thing. The old "put a wet noodle in a tigers butt" type thing.

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post #15 of 24 (permalink) Old 12-01-2017, 04:02 PM
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Yes a couple of washers will do the trick. But if you're able to get proper sag without them, then that's OK.

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post #16 of 24 (permalink) Old 12-01-2017, 07:21 PM
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If you report this to Yamaha 2nd level technical support (Y.E.S.), they’ll open a ticket and address the issue fast.

Okay. I’m kidding. Yamaha isn’t concerned with bikes under warranty that don’t run. I don’t guess they’d elevate their game for this problem. Not minimizing it- and looking forward to more info.

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post #17 of 24 (permalink) Old 09-28-2020, 05:44 PM
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I found this old post . FYI- My low mileage, under 5k 2009AE has a fork swoosh noise over deep or repetitive bumps. Light braking makes no difference. I weigh 180# set preload 3 rings showing. Comp and rebound Damping close to factory. I tried pumping forks at stand still , could not recreate sound. I suppose I could go to max spring preload and see if the noise changes...?
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post #18 of 24 (permalink) Old 09-29-2020, 07:28 PM
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With the damping at standard Yamaha 12 clicks out, that is very little damping and you may hear the oil going through the valving. That needs to be slowed down (more damping) so set both compression and rebound at 8 clicks out and see the difference.
As for the springs, those are 0.85 progressive springs which are inadequate for you.... try cranking the preload down all the way.

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post #19 of 24 (permalink) Old 10-01-2020, 08:55 PM
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I will do more clicks on the damping(control)...but doing that by definition, slows the response of the forks to irregularities of the road. Often, more compression and or rebound = firmer ride.But to what degree? And less likely to hear things because the forks are not moving as much. The preload presently at 3 lines showing. As is, bike has a comfortable ride . I will try your suggestions.

Last edited by jasonm.; 10-02-2020 at 07:36 AM.
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post #20 of 24 (permalink) Old 10-02-2020, 05:18 PM
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First rule, the springs have to be able to hold you up to get the proper sag, and the OEM springs won't do it. Preload has to be dialed in pretty much all the way for you, then you can play with damping.

Ray
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