rob
Sunday Rider
Posts: 8
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Post by rob on Jul 13, 2006 15:49:11 GMT
Hello I recently let go of bars to shake excess water off gloves, Scottish Weather, and bars shook from side to side. I have tested this again in dry and it did same only at exactly 50mph it rides through it and bars stop shaking. If you put even a light touch on bars during the shaking it stops so it's no tankslapper. I have checked head bearings they're not loose, I have checked tyre pressure both tyres 36psi as per book. It doesn't affect handling only when I take hands off I know I shouldn't but now it's got me curious. Sometimes it shakes worse than others for instance if it occurs over uneven surface. Any clues guys
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Post by lightspeed on Jul 13, 2006 16:34:08 GMT
Consensus is that the "book" is wrong about tire pressures. Most REXers run 36/42. Not sure that rear tire pressure would dramatically affect a steering head shake. How many kilometres on your front tire? Any sign of cupping? Forks been serviced lately (ie. fluid levels up to snuff? ) A lot of bikes do have a tendency to have a slight wobble, especially when decelerating through about 50 mph. If all the technical stuff checks out - don't worry, just don't take yer hands off the bars.
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Post by floog on Jul 13, 2006 16:34:57 GMT
ROB, you'll soon come to realise that my technical skills are on a par with my single digit IQ... But, a couple of obvious things before my more knowledgable peers arrive to help you.... Have you checked the wheel rims for cracks, any signs of warping or buckling from a drop or impact with something hard etc, and has the wheel been correctly balanced and weights fitted? Check also the handlebar clamp bolts and tighten if loose. It might even be down to a worn front tyre, so check that as well. Other than that you may be into wheel bearing faults or other issue which I'm sure the guy's and gals will advise you on..
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rob
Sunday Rider
Posts: 8
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Post by rob on Jul 13, 2006 17:24:50 GMT
Cheers Floog like you I'm not most technically minded I've checked bearings and nothing obvious on any wheels. The weights don't seem to have been looked at for a while although tyre is in good nick Lightspeed I'll change back tyre to 42psi and see thanks guys bikes done 10k its a 2001 do you think I should change fork oil
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Post by floog on Jul 13, 2006 18:03:49 GMT
ROB, again I'll bow to the guy's and gal's superior knowledge on the site.... ... According to the Kawasaki service manual, FORK OIL should be changed every 2 years or 15,000 miles (24,000km) whichever comes sooner As an aside, have you checked your suspension settings There are some settings on the site here which in my opinion transformed my bike which had been set to suit the previous owner, and didn't suit me. Those as a base, like many, I have then twiddled and tweaked a little at a time to see the differences and now have the bike set up exactly how I like it What a difference Worth a look and a twiddle slowly at your leisure, noting carefully what settings you use so that alterations are progressive.
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Post by bikesnoopy on Jul 13, 2006 21:27:06 GMT
Check wheel balance. Check wheel for trueness...both side to side and make sure it isnt ovalised due to a kerb/pothole or something. Check tyre condition. If worn,it may become unbalanced. If old,it'll be just rubbish. Check wheel bearings for play. Its unlikely that loose head bearings or rear tyre pressure will have any effect on a vibration or shake. Id be 99% sure it was wheel based. Loose head bearings are better than over tight ones. Go for 36/42 in your tyres. As Lightspeed says,the ZRX works much better on these pressures.
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Post by alexander903 on Jul 14, 2006 0:15:25 GMT
I had the same problem with my 11R(1999)the front tyre was about 60/70% worn so i changed it and cured the shake as well.Hope you have the same luck,cheers Dave
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rob
Sunday Rider
Posts: 8
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Post by rob on Jul 23, 2006 7:28:03 GMT
Thanks guys I had wheel balanced it was 30 grams out and although there is still a very sli9ght shake it has all but cured it
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Post by bikesnoopy on Jul 23, 2006 7:32:14 GMT
Good man Wheels do become un-balanced over a period of time as tread wears-sometimes unevenly-off of your tyres...
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Post by floog on Jul 23, 2006 7:49:23 GMT
Thanks guys I had wheel balanced it was 30 grams out and although there is still a very sli9ght shake it has all but cured it :ten: Excellent Enjoy your riding
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rob
Sunday Rider
Posts: 8
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Post by rob on Jul 23, 2006 9:08:59 GMT
I have also changed tyre pressures and thats made a difference I also fiddled with suspension set up and it has mae a huge difference
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Post by Godzilla on Jul 24, 2006 19:24:33 GMT
Rob although you have cured 99% of your problem, i had the same trouble at that speed but it was purely down to front tyre wear but id just thought id mention bar end weights.. after i fitted a pair of glitzy bars, minus the standard B/E weights the front end has become lighter and a bit twitchy. Nothing major to worry aboot but i thought it mite be worth a mention
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Post by bikesnoopy on Jul 24, 2006 21:17:17 GMT
Yeah,heavy bar end weights do make a difference...
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