Forks gone solid

[KoZi]

I will describe my opinions after few set ups when my friend will put them on. I also note what oil with will be in forks 

[gmars70970]

Sorry to resurrect an old thread.... but im pulling my hair out.

Quick recap before my current issue.
Changed fork seals,
10w oil 108mm Air Gap
New pads
Cleaned calipers
Battleaxe tyres fitted

Bike handles fine, can let go of the bars and the bike tracks straight with no wobbles or issues. Brakes feel good & no pulsing through the lever, floating discs checked with DTI and only 0.002" run out.

PROBLEM......
When braking for junction, traffic lights etc at around 10mph it feels like the front end bobs up & down. Not like a pogo stick, but feels more like up & down with each revolution of the front wheel.
I got the local garage to fit new tyres yesterday & check wheels bearings and they said everything was OK.

Anybody any ideas?
Could it be the 10w oil ?

[KiwiCol]

I doubt it's the 10w oil, sounds more like a brake issue.

Here's something inexpensive to try, raise the front of the bike up so the front wheel can turn freely (Jack or stand under the frame or whatever). Then put a cable tie on the front brake lever with only enough tension to just slightly grab on the disc, then turn the wheel by hand & see if you can notice resistance at 1 spot in particular.  If no, increase the zip tie 1 click & check again. 

If after doing this, until you can't turn it by hand, you can pretty much rule out brakes & bobbins.   If however you do strike a sticking area, check the bobbins in that spot, hell, give 'em all a clean & lube.

Another albeit obscure reason, could be balance weights.  New tire on, but is the balance correct?  You could probably check this while the front end is up as well.

Just some cheap things to try - let us know how it goes.

[GSXKING]

Steering head bearings perhaps 

[Hooli]

 Fork bushes?

It won't be the oil anyway.

[seth]

When emma's bike did exactly this.
It was the fork seals that were letting air in on the up stroke but not leaking or letting it out on thr down stroke so basicly pumping to forks solid .
I stripped both folks replaced both seals all the bushes and the fork oil .
They've been fine for the next 10k miles .

[gmars70970]

I've checked the discs using the cable tie method and all good.
Set the suspension to "standard" setting yesterday and still felt the same. Softened rebound 2 clicks today and was slightly better but could still feel it.

Seth I'm starting to wonder if it could be the same issue and I need to change the seals again.  🤔

I'll have another fettle with suspension settings tmrw.

Driving me mad now 🤯

[gmars70970]

I think I've came to the end of my abilities.

Adjustments with the compression & rebound make minimal difference to the front end "bounce" under slow braking.
I had the wife on the back on Sat and it was actually a little less noticeable so thinking maybe the back end is causing the front issue. Clutching at straws really.

Might have to PAY an EXPERT  😪