Hello,

Got a quick question about my '90 cbr1000f. I bought it about a month ago and don't really know much about its history, i.e. whats been changed out on it etc..... but its done 36k miles and when going thru slow corners (turning at junctions etc...) the front end feels a little rough if not bumpy almost. Do you think this is down to wheel bearings needing replaced or perhaps something wrong with the forks?

Thanks.

 

or Brakes, when I had problems with my back brakes, it cause roughness in the front (Linked brakes). I don't think this is your problem, but I think you should check both front and back.

 

One of the great things about our 1000's is the centerstand. Put yours on the centerstand and prop up the front wheel. I use a small scissors jack under the cast lugs on the front of the engine. Make sure the bike can't fall over on you. Then spin the front wheel. If the pads rub, use a little screwdriver to pry the pads slightly away from the rotors. Any roughness indicates bad wheel bearings. But I think your forks need a change of fluid. It may never have been changed and can be very dirty. If you have a manual you can do it yourself.

 

Is there any noise with the roughness?

Loose steering Head Bearings will make the front end feel rough over sharp bumps. Put it on the centre stand, sit on the seat so the front wheel is off the ground and drop it quickly on the front wheel. If you hear a knocking sound up the top then you need to re-tension ya bearings.


Also how much fork movement is going on? (Check with a cable tie)

 

i too would start with the forks. the brakes or wheel bearing problems would more than likely cause alot of excess noise that you didn't mention in your post. just my .02 cents worth

 

What that purple dinosaur doing?

 

he does whatever he wants. it has a mind of its own

 

Thanks for the info. I hope to get it checked out on sunday. I think it probably is the forks or the wheel bearings by what you have said. The head bearings feel fine to me.

Basically its a very dull vibration when doing slow turns on the bike felt directly thru the bars, its that which leads me to believe its the wheel bearings to blame. I will check the brakes out at the same time tho. ( No linked brakes on my model, its too early for that system. )

Will update the post once I check it out.

Any more ideas / suggestions are most welcome tho.

Thanks )

P.S Just away to ride home in snow ! Aberdeen weather is holding true as always.

 

Finally getting round to give an update,

Had front pads replaced by local garage, what they neglected to tell me was that the discs are shagged. So 400 miles on new pads and there nothing left of them already. So stripped the calipers at the weekend which has made things a lot smoother, and am ordering new discs and pads next week.

Basically the calipers weren't receeding after the lever was released, and the pads were always grinding on the discs. This coupled with loose bolts holding on the front fender was causing the roughness and noise.

Going to do the work myself this time tho to save some cash.

I know I should have checked the discs myself, but the garage should have never put new pads onto the discs the way they currently are, still we live and learn. So forks and bearings check out ok, got new tyres and chain / sprockets fitted at the weekend so once I get the brakes fixed I'll be all sorted for a fun summer )

So thanks for the help and info.

Cheers.