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| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | head shake question first off what are the factors that cause headshake? heres the scenario. 20 mph, no shake. 40-50 is when it shakes the worst, and 60+ no shake. my guess is the front tire, but not sure where to start to correct this problem. |
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| Retired Joined: Mar 2006 From: spokane, wa I Ride: 2006 R6 + 2008 RXV4.5 + 1985 RZ350 + 2003 YZ250F + 8 MORE | first check the obvious like tire condition-front and rear, along with tire pressure. do you have a mismatched set of tires? get the wheels in the air and check for a bent rim and rock the fork to see if there is any play in the steering head bearings. are the beads set all the way around on both sides of the tire, on both rims? |
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| Track School Dazed ![]() Joined: Oct 2005 From: CENTRAL I Ride: When I can | ![]()
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| Superbiker Joined: Mar 2009 From: Spokane Valley I Ride: Suzuki Boulevard C90, Honda CM250C, My Wife's Scooter | ![]() !KevinD |
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| | #7 |
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | thanks for all the replies, it does this on decelleration when i let go of the clipons. i checked my front end and everything is tight, and i don't do wheelies or anything, i did have to replace the rear tire a couple thousand miles ago, im just riding the last few miles out if the front before i replace it. so the tires arent the same, i went with a pilot road 2ct on the rear. so that sounds like it may be the problem. the front tire is cupped a bit, i might need to adjust the suspension too perhaps? |
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| MotoGP Contender Joined: Feb 2008 From: Mill Creek, Wa I Ride: '07 91niner & '07 KLR650 | ![]()
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| | #11 |
| Pit Crew Joined: Apr 2006 From: Seattle, WA I Ride: Too many | did it do it before you changed the tire? Sounds like a balance issue to me. If you bike has headshake just going down the highway, there's something wrong with it. Take it back to where you got your tire changed and have them check the balance. |
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| | #12 |
| Superbiker Joined: Sep 2008 From: Kenmore, WA I Ride: 2006 dr z400s, 1979 Suzuki GS750 (about to be 1000cc), 1965 Honda CL160 (racer), a couple of deathtrap pocketbikes. | how are your fork seals? check for even fork oil levels in both sides. |
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| Track School Dazed ![]() Joined: Oct 2005 From: CENTRAL I Ride: When I can | ![]()
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| | #14 |
| Retired Joined: Mar 2006 From: spokane, wa I Ride: 2006 R6 + 2008 RXV4.5 + 1985 RZ350 + 2003 YZ250F + 8 MORE | Getting the last few miles out of a front tire is your issue. I almost always replace my tires as a set. I don't do wheelies or burn outs or abrupt starts, and I am fairly agressive on corner entries, so my tires wear out somewhat evenly. I just don't try to push it on the last bit of tire life, so they both get replaced at the same time. |
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| MotoGP Champion Joined: Apr 2007 From: soap lake wa. I Ride: 00kaw12r, 97 tls1000, 96gsxr1260 turbo freakshow, kz1300gt, 88gsxr1100, 86gsxr750, 82gsx1100ez, 79kz1300, 75 ducati750gts, 72 gt550 cafe | Had leaky seals for TOO long...religously 36lbs air... same head shake, as you... cupped a tire in 2.5k. Some said, air too low... wen to 37lbs...slightly less shake... some said, not enough rebound, cranked in a bit more...slightly better... but had uneven and low fork oil still... did seals, gold valves and springs, headstock bearing check... still shook, on the way to mount new tire...(thanks SLYGRIN!!!!!!) NEW TIRE... NO MORE SHAKE... TIRE CUPPED= shake. got cupped, from low fork oil+ not enough rebound... balance, screwed at that time prolly... back to 36lbs psi... PERFECT+... CHECK IT ALL... FREE and clean, Ripp'n Last edited by Rippn; 08-08-2009 at 05:36 AM.. |
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| | #16 | ||
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | ![]() ![]() ill check it out ![]()
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thanks for the advice everyone i appreciate it, i'll see what i can find out. ooh and the bike in question is my avatar, with 6.5k miles. Last edited by noslofiveoh; 08-08-2009 at 06:10 PM.. | ||
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| | #17 |
| Retired Joined: Mar 2006 From: spokane, wa I Ride: 2006 R6 + 2008 RXV4.5 + 1985 RZ350 + 2003 YZ250F + 8 MORE | Check the rear tire to be sure it is seated all the way around on both sides, for balance, and also alignment. I once replaced a rear tire that started the same issue. Ditching the tire fixed the issue. Another time a set of used Dunlop 208's caused me instability issues that scared the crap out of me. Wierd how the rear can effect the front. |
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| | #18 | |
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | ![]()
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| | #19 |
| Superbiker Joined: Jan 2008 From: Muk, WA I Ride: Suzuki SV1000N, XR650R, CRF450R | Every street bike I have ever owned will start to wobble if you take you hands off the bars at about 40mph +/-. This is normal, you can not cure it. Don't take your hands off the bars at that speed. Here is a pretty good article on motorcycle stability, but the best was by Gordon Jennings, I just couldn't find it. http://bmwmotorcycletech.info/instability.htm |
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| | #20 |
| Pit Crew Joined: Jan 2008 From: Shoreline I Ride: GSXR600, CBR600, YZ444, RZ350 | No headshake before new rear tire? I would bet that your new rear tire is taller than your old rear tire, therefore raising the back of the bike. Either drop the fork tubes in the triple clamps to raise the front end, or replace the front tire to raise the front end. Or don't take your hands off the bars at 40+ mph while decelerating. My bike does it real bad, so I play around and watch the headlight wobble at night. Good times... |
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| | #22 |
| MotoGP Champion Joined: Apr 2007 From: soap lake wa. I Ride: 00kaw12r, 97 tls1000, 96gsxr1260 turbo freakshow, kz1300gt, 88gsxr1100, 86gsxr750, 82gsx1100ez, 79kz1300, 75 ducati750gts, 72 gt550 cafe | It IS NOT "NORMAL"... there is something loose, worn, improperly adjusted or set up, miss matched... Period. Find out what... get on a zzr forum, to see if it is something that happens FOR A REASON, to that bike. Also... check your fork bushings, by full lock ... grabing your font axle area and your slider end and rock it... look at your dust seal to see if it wiggles...kind of like looking at your headstock bearing for play... but lower. check the swing arm bearings by a tug on the rear of the swinger... check your wheel bearings too... FIND OUT WHY!!... it's ONLY gonna GET WORSE... FREE and clean, Ripp'n |
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| | #23 | |
| Zone Head Joined: Feb 2005 From: Pasco | ![]()
I have never had a street bike do this, it is NOT "normal". If it started with the rear tire change, I would start with having the rear tire rebalanced. It could be causing an oscillation that transfers to the front end. If a balance doesnt help, dismount the rear tire and spin it on the rim 180 degrees, rebalance, and see if that helps. | |
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| | #24 |
| Zone Head Joined: Jul 2009 From: Corvallis, OR I Ride: 08 Hypervibrator | My vote is your steering bearing needs a little tightening (a good front tire is needed too!) |
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| | #27 |
| MotoGP Champion Joined: Apr 2007 From: soap lake wa. I Ride: 00kaw12r, 97 tls1000, 96gsxr1260 turbo freakshow, kz1300gt, 88gsxr1100, 86gsxr750, 82gsx1100ez, 79kz1300, 75 ducati750gts, 72 gt550 cafe | PETE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! MY 97 TL1000S DOSEN'T EVEN SHAKE UNDER DECELERATION... from 70+ DOWN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Bwhahahahahahaahahahahaahahahahaahahahhaaa!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! OOOPS!...sorry!!!!!!!!!!!!!!!!!!!.... FREE and clean, Ripp'n |
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| | #28 |
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | well at this point i'm going to start with a new front tire, because i know for sure that the one i have now is not helping (for all i know is the problem) one of these night's i'll get to a bike night and see if i can get someone with more experience than myself check it out if it's not too much trouble. |
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| | #29 |
| MotoGP Contender Joined: Jun 2007 From: Covington, WA I Ride: RC51, TL1000R, GSXR 750 (in pieces), Magna 1100, R6 (track) | How did you check rear tire alignment? Going by the marks on the swingarm=fail...if you measured from the rear of the swingarm to the axle, you'll get much more reliable results. Usually a misaligned rear will have headshakes on hard acceleration rather than decel though. |
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| | #30 |
| MotoGP Champion Joined: Apr 2007 From: soap lake wa. I Ride: 00kaw12r, 97 tls1000, 96gsxr1260 turbo freakshow, kz1300gt, 88gsxr1100, 86gsxr750, 82gsx1100ez, 79kz1300, 75 ducati750gts, 72 gt550 cafe | FIELD STRIP IT AT 'BUCKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! YAAAAAHOOOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!! Lets do TEAM rht/lft side strip time trials... ignore the 4' foot oxygen tank and ported butterfly gun!!!!!!!!!!!!!!!!!!!!!!!!! WAIT!!!!!... James, can you bring about 8 of them 2000lbr' firefighter /hazmat scuba numbers... w/ a gang manifold...Can ya get a "jaws of life", for the chain?????? and a BIG PIPE WRENCH...HECK YA!!!!!!!!!!!!!!!! I getta to "work" w/ somebody that's ALREADY gone to jail for stripp'n bikes... we aint gotta put it back togather, do we?????... we do????... shoot!!!!!!!!!!!!!!!!!!!!!!...I'm out...I'll NEVER remember...wait...what day???? Bwhahahahahahahahahahahahaahhhaaa!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! FREE and clean, Ripp'n |
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| | #31 | |
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | ![]()
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| | #33 |
| WMRRA Qualifier Joined: Apr 2008 From: Beaverton, OR I Ride: Rizla, RC51 | Did you remove the bar ends? Whese small insignificant pieces of metal when removed will cause your bars to act funny, vibrations, wobble ect...... |
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| | #34 |
| Endorsed Joined: Apr 2007 From: kennewick I Ride: black zzr600 | i took em off and polished them but i put them back on |
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