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Post by lds1973 on Jul 8, 2009 19:45:40 GMT
HI Totally chuffed to bits with my new (to me) 600 diversion 1998, but today as I rode home from work I had forgot to do up my belt on my jacket so decided to take hands from bars (which I have done on all my other bikes (600 bandit, gsxr750, zx6r, ktm250exc) with no problem, this bike just went straight into a tank slapper and I was only going about 25-30. My tyres are new, bike has done 10k miles, rear shock looks good and set at the hardest preload. I am wondering if it just the bikes geometry or is there something wrong?  ? Fork seals are souns too. Mind you at 70+mph when looking down to front wheel it does look like its juddering up and down very quickly but i cant feel anything at bars. Cant say I have ever noticed this on my other bikes at this speed. Help would be greatly appreciated. Cheers Lee |
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Post by pilgrim on Jul 8, 2009 20:49:50 GMT
Just as a start you'll have to check front wheel balance and then wheel alignment, front to back. Other things may be to blame but probably the former.
Other suggestions may follow..........
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Post by amorti on Jul 12, 2009 23:48:26 GMT
Mine does it too, seems to be a common problem?
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Post by billywhizz on Jul 13, 2009 9:44:04 GMT
wheel wobble with hands free! quite usual around 20 - 40 mph. not the full range, some bikes have it at different speed. some say it's the luggage rack, top box, after market screen even... best advice,///// don't take hands off!  regards the other, thats what the forks do, but if can't feel it, the forks must be working proper...  |
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Post by beeblemaster on Jul 13, 2009 10:22:47 GMT
Mine goes mental too. I'm pretty certain it didn't do it before I had the tyres changed, so we're guessing it's cos they're not balanced.
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Post by m40man on Jul 13, 2009 10:31:05 GMT
I fit my own tyres & I don't (generally) balance them. And this wobble doesn't exist on any of my bikes. So wheel balance might not be the issue. When I had my D6's, they definately were much less 'sans wobble' when I didn't have my top box on. But both wobbled a bit, when no-handed, except when I was carrying a pillion . Points to summat at the front end, but dunno what. I always suspected the forks, being the skinnier older ones on my D6's, with next to no bracing. ........... I'm not sure my obs help much. It's just how I found mine to behave  . |
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Post by Deleted on Jul 13, 2009 10:58:18 GMT
Mine goes mental too. I'm pretty certain it didn't do it before I had the tyres changed, so we're guessing it's cos they're not balanced. You need to change your mechanic, or pay more. |
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Post by beeblemaster on Jul 13, 2009 12:53:32 GMT
Mine goes mental too. I'm pretty certain it didn't do it before I had the tyres changed, so we're guessing it's cos they're not balanced. You need to change your mechanic, or pay more. For the money I don't pay, there's nothing wrong with the one I've got thank you ;D |
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Post by bobh on Jul 13, 2009 21:14:03 GMT
I'm with M40man - I don't think wheel balance is going to be a problem below 60-70, maybe higher. If it really was bad enough to cause a problem at 20-30 then it would only get worse as you went faster, so I'd have thought you'd get really bad vibration at higher speeds.
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Post by CD on Jul 14, 2009 16:12:05 GMT
All bikes do a front wheel shimmie caused by a resonant frequency between the tyre's self-centering action and the wheel gyro effect, but it should never get into a tank slapper. 70's bike do it around 30, sports bikes around 60. Divvies around 40 to 45. It not obvious on sports bikes because the higher speed = higher frequency wiggle more easily damped-out by the rider's weight on the bars.
It should stop as soon as you hold onto the bars. If its tank slapping, I'd be looking at the head bearings. My 900 had a noticeable wiggle at around 45, which vanished when I put in new steering bearings.
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