GSX-R 600 K4 Front forks - problems

Hi all,


I have been changing the oil to the forks of my gsx-r 600 k4, after re-
install it again in place, went to try it and its a big mess,
initially even with the standard settings the fork looks too stiff,
but under braking the front compress fully to the end of it, try to
give more preload in the spring, and it's the same.... other thing it
makes is, in higher speeds when hit the front lever, i feel a big
vibration......
I heard this can be caused by air inside the cartridge...

Any ideas?????

Thanks

Jaime
Portugal

 

How much oil did you use?

Did you measure volume or oil or depth to level, if latter to/from what
point?

What weight of oil did you use?

 

In the beginning i put a little bit under the recommended quantitty,
but now i have refill it, and have the exact amount especify in the
service manual.

After some tests, the front is now working ok, but is still juddering
when i brake harder under highest speeds, it guet's better when i
close the rebound, but then it becames to stiff.

Jaime

 

Forgot to tell,

I'm using Motorex Oil 5w as specified in the service manual
479 ml in each side of the fork...

 

I haven't been to the www.racetech.com site, and my weight is 83 kg's

before i change the oil, the forks were working ok with the std
settings, after i change the oil they aren´t ,

Probably to reduce the compression damping i have to add a little bit
more oil, because the front is still diving a lot, after that will try
it again to see how it feels, as soon the front is ok in matters of
compression, i will start to find the perfect rebound setting.

Jaime

 

OK,

Thanks for the info

i will make that, then after try it i will write here my impressions.

Cheers
Jaime

 

So here i'am, to make the latest update.

I've changed the brake discs and pads, but still have the vibration
under braking, the funny thing is if i go at 150 km/h and brake hard,
the bike goes very smooth, as soon as a get to the 80km/h the front
starts to vibe, after the speed goes under 70km/h the bike goes smooth
again....

Next step is tho try a different wheel to see if is bearings problems,
or tire.

Best Regards
Jaime

 

Have you re-torqued the steering head bearings recently?

 

nope, and that is also a good idea to do that

 

After re-torqued the steering head bearings, and change the front
wheel bearing, the bike keeps doing the same vibration. a go now try
with a different wheel to check, if it's not the wheel.

Cheers
Jaime

 

I All, it's me again, changing the front wheel, produce no effect in
the vibration of the front, the vibe is still there when braking,
could it be the suspension.

Cheers
Jaime
Portugal