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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> 50 mph buck /cgi-bin/YaBB.pl?num=1377053110 Message started by pgambr on 08/20/13 at 19:45:09 |
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Title: 50 mph buck Post by pgambr on 08/20/13 at 19:45:09 I posted this once and got some good insight; although, I'm still having some problems so I thought I would try one more time. When I get above 50 mph the front end starts to vibrate or even buck. The faster you go the worse it gets. Sometimes it doesn't do it, but it happens quite often. A friend who is a mechanic looked at it and can't figure it out. He said it the steering column bearings were loose so he tightened them up. Now it only pulls to one side or another. He said the forks look good, new tires, tubes, everything looks in good condition. If you can offer some insight please do. Best regards. |
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Title: Re: 50 mph buck Post by WD on 08/20/13 at 20:30:21 Did he happen to check fluid level and spring conditions in the fork tubes? Axle bearings? Front wheel running true, as in no loose or broken spokes? And just for giggles, check the back wheel, bearings spokes and alignment. Oh, and the swingarm bushings or bearings, whatever they stuffed in them on the line that day. A problem in the rear of the bike can manifest itself up front. |
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Title: Re: 50 mph buck Post by pgambr on 08/20/13 at 20:49:18 Thanks WD, much appreciated. From what I know: Axle bearings - should be good and greased Forks - not sure, plenty of pressure, travel feels normal, not leaking oil Alignment - should be good, reputable shop put on tires Spokes - don't know Bushings - no idea I will pass on those thoughts. He still has the bike for a bit longer. Thanks again, best regards. |
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Title: Re: 50 mph buck Post by justin_o_guy2 on 08/20/13 at 21:21:32 Did "Bucking" & tire iinstallation happen at the same time? |
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Title: Re: 50 mph buck Post by gizzo on 08/21/13 at 02:23:36 is the tyre (tire) mounted on the bead the whole way around? Sometimes the tyre fitters don't pay enough attention and the bead of the tyre stays down on part of the circumference. So the tyre has a low spot that humps each time it goes around. If so, you can re seat the tyre properly by letting it deflate, smear a bunch of dish liquid, coconut oil or brake fluid (my fave) into the bead area then inflate the bejeezus out of it til the tyre pops up onto the bead all the way. |
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Title: Re: 50 mph buck Post by pgambr on 08/21/13 at 02:56:42 Unfortunately, it has done this before the tire change and It seems to get worse with time. Everyone, thanks for your insight. |
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Title: Re: 50 mph buck Post by justin_o_guy2 on 08/21/13 at 10:28:58 Get the front end off the ground,put a piece of tape on the fender so it Aaaalmost toiuches the tire, spin the wheel,, |
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Title: Re: 50 mph buck Post by Serowbot on 08/21/13 at 11:22:38 How old are your tires?... feel all around the circumference.. it could be tread separation... |
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Title: Re: 50 mph buck Post by justin_o_guy2 on 08/21/13 at 11:23:36 Mmmm,, separation,, that causes anxiety.. |
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Title: Re: 50 mph buck Post by Serowbot on 08/21/13 at 11:26:42 243B3D3A2720112111293B377C4E0 wrote:
...it surely does... ...and no one here wonders how we have so many posts... :-X... |
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Title: Re: 50 mph buck Post by WD on 08/21/13 at 11:55:14 I know why you two have so many posts... but I take a lot of time off from here, get annoyed and disappear for months or longer at a time. |
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Title: Re: 50 mph buck Post by pgambr on 08/21/13 at 21:19:11 The bucking started long before the tire change. I have been refurbishing my 06 with a number of corrections. Basic stuff, just trying to keep it stock and running well. I have fixed a number of items; although, this one has been causing me some headaches. My friend who is a professional mechanic and is working on it. He works on machinery, cars, so fourth. He can usually figure anything out in no time and he is a bit stumped. I will take all of your suggestions into advisement. I appreciate your insight and if you have any other thoughts please let me know. Best regards. |
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Title: Re: 50 mph buck Post by justin_o_guy2 on 08/22/13 at 03:50:15 637C7A7D60675666566E7C703B090 wrote:
Do you understand why I say this? |
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Title: Re: 50 mph buck Post by greenmonster on 08/22/13 at 10:09:15 Do you happen to have a wind screen on this bike? The reason I ask is that I had a nasty buck/wobble when I hit about 50. Then I adjusted the screen and the wobble stopped. |
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Title: Re: 50 mph buck Post by pgambr on 08/22/13 at 16:22:46 JOG, I think I hear you clucking. I believe you want me to test the circucmference of the outer-surface of the tire for any abnormalities as it turns. Is that correct? This should be satisfactory. When I had the tire put on it was very close to fender. The tire ended up being much thicker than I thought it would be. So much in fact I had to adjust the fender from the back bolts to pull the front of it up just a bit. Regarding the windshield, I am curious about your experiences gmonster. I took mine off once to see what it be like to have all that free air hit you. It hit me bit harder than I expected. I went about a 100 yards and thought I really need that thing back on. Regardless, the shimy / buck was reduced to a bare minimum. With the windshield on sometimes it bucks so hard it is inconceivable that a stock windshield could cause that much discourse. If it were the windshield I would be likely to believe I would have read a number of posts concerning that issue. I sure the windshield extenuates the root core problem. Thanks again, please feel free to add any thoughts |
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Title: Re: 50 mph buck Post by WD on 08/22/13 at 17:20:15 How deep south is deep south? Because one of us may need to look it over for you... |
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Title: Re: 50 mph buck Post by pgambr on 08/22/13 at 19:33:33 WD, did you get my IM? |
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