since one year I have the problem of heavy fork shake/vibrations when doing donuts and at the end of stoppies. I changed the steering bearing, brake rotors and pads, put thicker oil in the fork, changed tires but all that didnīt help......anybody got an idea what else it could be?

 

i had the same problem on my bike and i had it for a year , yesterday i changed my front brake lines to thicker rubber ones and it seems to be not doing it any more , but my **** was looking like it was going to fall apart on a stoppies man, and it really happened hardcore.

 

does your brake fluid look like coke cola?

 

no, have new brake fluid too

 

fork bushes??? have heard that they can cause vibration and/or head shake when worn out.

 

does your front wheel spin freely when it is off the ground?

 

when is the last time you changed the brake pads?

I have the same issue right now, but only when I do burn outs..stoppies are fine. I put the bike on a front stand and the front wheel spins beautifully. I flushed the fluid too. The only other things I can think of to try are to change the pads or the front tire. Maybe the pads are glazed too much or maybe the tire is worn funny/cupped

 

iīve use some different an new brake pads but itīs always the same ****.

now my last option is i exchange the fork. thats the last thing what i can do! all other things are new at the front of the bike.

 

When you installed new bearings, did you installed TAPERED BEARINGS?

If not, get a set of All ***** tapered bearings..


The stock ball bearings are junk.. Known for head shakes..


Put a all ***** kit in ym friends f4i, **** is SOLID now

 

yes, i installed tapered bearings

rotors,brake pads,front tire,steering bearing all this **** is new but the fork shake. brake fluid is ok too!

I hate this **** and i cantīt found the reason

 

Always change your brake lines to steelbreaded lines. What happens under heavy breaking the fluid will bounce off of the weak parts of your stock lines and ballon and bounce back. It causes an inconstant preshure and will cause a shake.

 

i have steelbreaded lines!

 

Itīs not head shake, the fork shakes forward and backward very fast so it vibrates.

I think the last thing to do is the fork bushings

 

and wheel bearings. also try to soften up your front suspension a little bit... dont run it maxed..

 

i have it "hard" BUT i think itīs to soft i can push down the bike very easy

 

Change your fork bushings if you havent allready. Its good to check these everytime the fork seals are changed. If you start to se some copper color on the darker surface on the bushing then its timne to change it. Its suppose to have the same color all around the surface.

I had the same problem as you have. Changed everything and the problem is now gone.

 

yes man!! last saturday i got back my fork. itīs complete overhauled and now i can ride without shake and vibrations :YEAH :YEAH

iīm happy

 

my fork was overhaueld and everything was fine for the last three days. today i practiced some stuff and the shaking came back. the mechanic who made my fork told me he has not changed the bushings, he only smoothed them out by grinding the bushings. hope this is the problem with my fork. Are you sure the bushings are the reason for this ****?

 

there not expensive and something alot of ppl overlook. just change them anyway and worst case is you can cancell them out as being the problem if it doesnt fix it. why didnt the mechanic just change them if he has them all apart anyway?

 

have your mechanic check your rotor run out...