PGA XX Posted March 31, 2003 Share Posted March 31, 2003 Someone else mentioned this earlier, but I wasn't sure if anyone else experiences this. I went for a ride today and it seems to happen in the top of first or second at high rpm when I let go of the handle bars. As the bike slows, it develops a severe shake. I thought I was going into a tank slapper. :shock: The strange thing is, it only seems to happen on certain types of asphalt. I don't know if the road surface can cause it, but it doesn't seem to happen every time I attempt to make it happen. I checked tire pressure, and my steering head bearings seem to be o.k. Lance Silver '02 Quote Link to comment Share on other sites More sharing options...
Mithrandir Posted March 31, 2003 Share Posted March 31, 2003 you'll just have to learn to land those wheelies a bit better then to avoid the headshakes.... :wink: Quote Link to comment Share on other sites More sharing options...
ElChingonCabron Posted March 31, 2003 Share Posted March 31, 2003 Did you have any luggage? Used to happen to me whenever I used my saddlebags on other motos.... nuther reason to never let go :wink: Cheers- Sanch Quote Link to comment Share on other sites More sharing options...
Involute Posted March 31, 2003 Share Posted March 31, 2003 Time to snug up the stem bearings methinks. Quote Link to comment Share on other sites More sharing options...
RodeRash Posted March 31, 2003 Share Posted March 31, 2003 How are your tires? Worn or cupped tires (along with out of adjustment steering head bearings) can cause a wobble. Never seen it go to a tank slapper. The really stupid thing about finding out that the front end wobbles when you let off the gas and let go of the bars......You'll keep on doing it, just to see if it still happens. :grin: Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted March 31, 2003 Share Posted March 31, 2003 My Wing would do that at 40mph when the front tire was worn out. Put a new tire on and it went away. But I'm with Joe, the last thing I'm thinking about at the top of first gear is letting go of the bars. :shock: Quote Link to comment Share on other sites More sharing options...
BIG BOY Posted March 31, 2003 Share Posted March 31, 2003 I just got the 45/46 Avon combo. From say...49 down to around 40 mph i get some shake when i leave go of the bars. I could see if i had bad tires, but they're bran new, around 120 miles on them. What do you think it could be? I'm gunna try it with no luggage on and see if it does it. Quote Link to comment Share on other sites More sharing options...
PGA XX Posted March 31, 2003 Author Share Posted March 31, 2003 Big Boy, that is exactly what I'm feeling. I noticed it first w/ my hands on the bars, in first gear @ 8k+ rpm riding twisties. I noticed a slight wobble under deceleration/when I cut the throttle w/ light grip pressure. It sounds like it might be the tire. I'm almost due for a new one anyway. Thanks, Lance Quote Link to comment Share on other sites More sharing options...
SwampNut Posted March 31, 2003 Share Posted March 31, 2003 That's a common issue. Many bike/tire combos do this. I haven't seen it with the 45/46, but did with a 39/36. It often is an indicator that your steering head bearings are too loose, so check those. Quote Link to comment Share on other sites More sharing options...
Northman Posted April 1, 2003 Share Posted April 1, 2003 I had a similar issue (not a shake, but an oscillation in the bars when de-celerating around 40), but never really worried about it. When I removed my triples last week, I found the head bearings were actually quite loose, with the locknut barely finger tight. I'll have new bearings installed this week, and should be on the road by the weekend. It'll be interesting to see what kind of effect this work will have on the oscillations, as I'll still be on the tire that was doing it in the fall. Quote Link to comment Share on other sites More sharing options...
sirjames Posted April 2, 2003 Share Posted April 2, 2003 Every bike I have had (8 or so) has had head shake at SOME speed. My ST1100 at 45 mph, my XX at around 35 mph. With the ST, I comb my hair at 55 with the cruise on so I dont wipe out :wink: Quote Link to comment Share on other sites More sharing options...
tomek Posted April 7, 2003 Share Posted April 7, 2003 Try to wheelie the bike. "When it`s wheeling it`s not shaking"-Scott Russell 1994 Some bikes do that,XX is one of them unless you put fresh front tire every 200 miles.But seriously you should be more carefull,look what happend to poor Kato on RCV 211 at Suzuka.I pray for him. Quote Link to comment Share on other sites More sharing options...
BIG BOY Posted April 7, 2003 Share Posted April 7, 2003 I have bran new tires on, so i don't think that's the issue with me. When i raise the fork tubes i'll check the tightness of the triple to see if that's the problem. Quote Link to comment Share on other sites More sharing options...
tomek Posted April 8, 2003 Share Posted April 8, 2003 He got to into massive tankslapper and highsided,hit the fence,his heart stopped,airlifted,fighting for his life,,,,, Quote Link to comment Share on other sites More sharing options...
DaveK Posted April 8, 2003 Share Posted April 8, 2003 I had the same problem I discovered coming back form the Nexxt last year. I took off the Renntec rack and the shit on it...Problem Solved ! Quote Link to comment Share on other sites More sharing options...
Dutch Posted April 8, 2003 Share Posted April 8, 2003 I had the same problem last year. Turned out it was the crappy, cupped D207 on the front. Replaced the tires with M1s and the wobble disappeared. Quote Link to comment Share on other sites More sharing options...
XX Posted April 8, 2003 Share Posted April 8, 2003 i saw that (roberts), i eeked, my wife came running in from the other room wanted to know what was wrong with our son, lol... had to explain to her that did look :shock: like it felt good and certainly not confident! let me me brave here and ask a question - tankslapper - does this mean side to side slapping or up and down slapping....? cuz roberts looked like side to side and for some reason i alway thought it a tankslapper (for some stupid reason) was up and down).... :oops: Quote Link to comment Share on other sites More sharing options...
Dutch Posted April 8, 2003 Share Posted April 8, 2003 Tankslappers are side to side. Basically, much amplified headshake. To the point that the movement of the forks is knocking the rear out a couple of feet. Quote Link to comment Share on other sites More sharing options...
REXX Posted April 9, 2003 Share Posted April 9, 2003 If you find yourself in a tankslapper what is the best course of action to rectify it? Quote Link to comment Share on other sites More sharing options...
PGA XX Posted April 9, 2003 Author Share Posted April 9, 2003 Pray that you wore your leathers that day :wink: Quote Link to comment Share on other sites More sharing options...
mickcbr1100 Posted April 9, 2003 Share Posted April 9, 2003 These are stills from the 1999 Isle of Man TT. Duke Video, probably the most (in)famous tankslapper seen over here :shock: . Paul Orritt on Bray Hill when it just went into a slap, suffered serious arm injuries but lived to race another day. The actual video clip is awesome and a real good advert for steering dampers Quote Link to comment Share on other sites More sharing options...
SwampNut Posted April 10, 2003 Share Posted April 10, 2003 Look at his head. No matter what was going on, he kept looking where he needed to go. It didn't help this time, but that can often be the difference in recovering from any unexpected problems in a turn. Quote Link to comment Share on other sites More sharing options...
Dutch Posted April 10, 2003 Share Posted April 10, 2003 Same wreck, but in a video file. http://www.joe250.com/video/Tankslapper2.wmv Here's a good site that explains tankslappers and headshake. http://www.joe250.com/ride/tankslapper.htm Quote Link to comment Share on other sites More sharing options...
REXX Posted April 11, 2003 Share Posted April 11, 2003 Good read and info, thanks Dutch. Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted April 14, 2003 Share Posted April 14, 2003 I just switched to the 45/46's from totally trashed 020's and my decelleration with hands off bars at 45 mph is almost totally gone. I'm wondering if this whole problem is the allignment problem with front to rear. I have been trusting the swingarm lines to this point. I've tried the string thing to check allign. with not much sucess. Anybody else?? Quote Link to comment Share on other sites More sharing options...
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