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Mondo Limbo
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« on: August 20, 2013, 01:12:47 PM » |
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I just noticed the other day that if I take my hands off the bars the front wheel starts to shake slowly then get worse after a few seconds. Grabbing the bar immediately stops the wobble - and it then feels completely normal. Seems to only happen around 40 mph. Haven't noticed any wobble or weird handling otherwise. Tires are Cobras with just a couple thousand miles on them. Think this is just an out of balance thing or something worse? The only time I've encountered anything like this before is when a front tire was severely worn.
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F6Dave
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« Reply #1 on: August 20, 2013, 01:16:29 PM » |
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I'd put it on a lift and rotate it to see how true it is. I like Avons, but they seem to have more of these issues than most. I've read they stand behind their product and will replace bad tires, and even pay for mounting.
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old2soon
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« Reply #2 on: August 20, 2013, 02:01:42 PM » |
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Check BOTH upper shock bushings. IF the bolt is off center R % R both shock bushings. May as well check the lowers while yer at it. Let us know what you find out. RIDE SAFE.
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Today is the tommorow you worried about yesterday. If at first you don't succeed screw it-save it for nite check. 1964 1968 U S Navy. Two cruises off Nam.
VRCCDS0240 2012 GL1800 Gold Wing Motor Trike conversion
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Ricky-D
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« Reply #3 on: August 20, 2013, 02:16:52 PM » |
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Experimenting with tire pressure may alleviate the problem.
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2000_Valkyrie_Interstate
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sandy
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« Reply #4 on: August 20, 2013, 05:23:51 PM » |
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I agree on the shock bushings. Run Avon Cobras at 42 F and 46 R. Depending on bike's mileage, it could be swingarm bearings or stearing head bearings.
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Michvalk
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« Reply #5 on: August 20, 2013, 08:02:17 PM » |
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Steering stem bearing adjustment. I retorqued mine and cleared up that same problem  |
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Sourdough
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« Reply #6 on: August 22, 2013, 06:08:04 AM » |
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I had the same issue as you are having with wobble at 40mph on a new tire. After checking several of the things mentioned I finally put another Cobra on the front.
Problem solved. Tire was bad; but I don't know why. Nothing was obvious
to the eye. Run Cobra's on both my Valks and this was the only problem I
ever had with them.
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01 I/S Black/Beige
97 Standard Bumblebee
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F6Dave
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« Reply #7 on: August 22, 2013, 07:14:46 AM » |
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Winemkr, I'm curious, did Avon pay for the replacement and mounting? I had a front Venom with a wobble that I should have replaced, but just lived with it. It wobbled, but only a low speeds while turning left.
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Ricky-D
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« Reply #8 on: August 22, 2013, 07:42:49 AM » |
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I don't think loose bearings in the steering stem can impart a wobble to the drive ability of the bike.
As long a the bearings are in good condition and not indexed.
Tightening down on the bearings will act like a steering dampener and can attenuate any propensity to wobble but this is not correcting the cause of the wobble problem, but rather only overwhelming the problem with tightness. A danger in it's own way.
As I had earlier stated, the majority of wobble problems are tire related.
And additionally, the majority of the tire shortcomings are related to the layup of the belts and cords within the tire body itself. You may not be able to see a bad product, but it will become very evident when you ride on the tire. Wobbles, out of round and non-concentric sidewalls are just some of the quality issues with motorcycle tires.
Some of the least possible reasons for wobbles are mainly overstated too many times and consist of swing-arm bearings and shock bushings. I'm not saying these could never be the problem, but swing-arm problems are very rare and I've never understood how shock bushings can cause a wobble when the swing-arm is in solid condition.
It's the tires.
Bet on it!
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2000_Valkyrie_Interstate
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Pete
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« Reply #9 on: August 22, 2013, 09:15:20 AM » |
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Sounds like a classic tire wear issue, and/or tread pattern and under inflation.
Run your flat hand over the tire if you can feel highs and lows you have identified the issue.
It may help to raise the air pressure, but it will not cure the problem completely.
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Sourdough
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« Reply #10 on: August 22, 2013, 10:00:25 AM » |
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F6Dave...sent you a PM
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01 I/S Black/Beige
97 Standard Bumblebee
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