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High speed weave.
- beefsquasher
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Starts at 110mph and builds in intensity up to 130mph where it gets so bad that I chicken out. Definitely a back of the bike thing. The handlebars stay straight, the back of the bike just feels like it moves from side to side. People following me can easily see it. No change of body position helps. Low freqency, not a wobble or handlebar shake thing.
ONLY happens when HARD on the power. As soon as you lift, she's a straight shooter.
Here's what I've done to try and stop this:
Center rear wheel to be inline with front wheel.
New wheel bearings.
New swingarm bearings.
Braced stock length swingarm.
Ohlins rear shocks.
Fork brace.
Taper steering head bearings.
New tires (Avon Roadrider).
Steering damper (no effect!)
Bigger balls (only works until I remember I would like to live to use them)
Any theories?
-Dave
1977 KZ1000 Mutt - 1075, Kenny Harmon Cams .400", RS34, Kerker, Dyna S
1997 Honda XR250R
1977 Yamaha XS360
1972 BMW R60/5
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- PLUMMEN
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Still recovering,some days are better than others.
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- hocbj23
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- beefsquasher
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I don't usually travel at sustained speeds over 100. I just need to get this wobble nailed down so I don't go flying off my bike at the end of the dragstrip.
-Dave
1977 KZ1000 Mutt - 1075, Kenny Harmon Cams .400", RS34, Kerker, Dyna S
1997 Honda XR250R
1977 Yamaha XS360
1972 BMW R60/5
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- PLUMMEN
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checked rear tire and wheel,no slipped belts in tire?
rear tire balanced?
have you tried jacking up rear of bike and shaking wheel/cush drive?
kind of hard to do long distance autopsy over the computer! :laugh:
Still recovering,some days are better than others.
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- trianglelaguna
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- New and improved - extra strength
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1976 KZ900
2003 ZX12R
2007 FZ1000
2004 ninja 250R for wife
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- TeK9iNe
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- What did you do!?!
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I would check the runout of the wheel and the tire on the wheel to make sure both are dead true. Assuming the wheel is true and the tire is true on the wheel, the only other thing I can think of that you haven't covered is the chain/sprockets. If you check the chain tension while you turn the rear wheel does the top length of chain get tight and loose as if a section of it is worn more than another section? I don't know if this could cause the weave, but if the tension between the countersprocket and rear sprocket varies, it might be pulling and relaxing the pull on the rear sprocket/axle causing the swingarm to flex a tiny bit. Just a guess; no personal experience with this problem. Ed
Good theory...
Maybe she just doesnt like it. Mine starts to feel squirly at 110-115mph, and I don't particularly need to be going that fast on a relic of a bike anyways.
Course, I live in Canada, where all the drivers are nutso $#&@s anyways!
:laugh:
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- seanbarney41
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- '79 kz1000 LTD '75 Honda CB750
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- Patton
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...Center rear wheel to be inline with front wheel....
Should center rear wheel by assuring equal distance on both sides between centerline of swingarm pivot bolt and centerline of rear axle.
Chain should be viewed in straight line and with no jog as it leaves rear sprocket and mounts c/s sprockot.
Tire track lines should be parallel, but not necessarily travel the exact same line.
Good Fortune!
1973 Z1
KZ900 LTD
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- Old Man Rock
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Had similar with my ZX636 front end... Only above 85mph did I notice.... Turned out the rotors where warped...
Would drag the pads a tad on the warp thus causing the wobble effect...
Raise the front end...
While observing over head, spin the front tire looking at rotors(s is dualies)...
I replaced rotors, 110mph no issues to date other then crapping my pants....:blush:
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- WABBMW
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- Let The Good Times Roll !
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I have also experienced a tire that was very round, and in good static balance, but caused a 40 MPH wobble due to being hard and soft or perhaps thick and thin in places as you go around the circumference. Poorly manufactured.
One more thing. The bad tire was on the rear of my bike, but caused the front and handlebars to wobble. So check your front tire and wheel also.
New tires changed my bike from semi-scary to velvety smooth with great traction. Extremely pleasant and confidence inspiring.
Bill Baker
Houston, Texas
1982 KZ650 CSR
2008 Yamaha FZ1
2006 Yamaha FZ1
1977 Honda Supersport 750 four (sold)
1984 Honda Nighthawk 650 (sold)
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