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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through May 21, 2010 » Front end vibration starting appr 75 mph. « Previous Next »

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Motorhead102482
Posted on Monday, May 17, 2010 - 06:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have an uncomfortable vibration starting at 75 mph or so and gets stronger. Does anyone know what this could be? It's definitely not engine vibration as it is smooth as glass up until about that speed no matter what engine RPM. I would say maybe an out of balance tire, but I wouldn't think the tires would be out of balance after only 800 mi. Is it possible I have the suspension too stiff? Also, has anyone on here ditched the wheel weights and used Dynabeads or equivalent to balance their tires?
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Ratbuell
Posted on Monday, May 17, 2010 - 08:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

1. tire pressure
2. suspension setting
3. wheel weight

That's where I'd start.
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Motorhead102482
Posted on Monday, May 17, 2010 - 08:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the help. I'll give those a whirl. If anyone has tried dynabeads, let me know what you think.
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1125rcya
Posted on Monday, May 17, 2010 - 06:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you ride wheelies or pick the front of the bike up and drop it hard it tends to put bumps on the front tire! Feel the front tire with your hands for a bumpy tire.
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Joshinga
Posted on Monday, May 17, 2010 - 06:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I use them I like them so far. My dad uses them in his shop and he swears by them
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Motorhead102482
Posted on Wednesday, May 19, 2010 - 05:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think i solved most of the vibration. I had the suspension too stiff for my weight, so I backed it off a bit. It runs better now. It doesn't help that the roads around here are littered with pots holes, cracks, and uneven surfaces. But the suspension adjustment definitely helped in the places where the road is smooth.

I think I'm going to try the dynabeads out. Thanks for the responses from everyone.
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Ratbuell
Posted on Wednesday, May 19, 2010 - 09:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you've got bad roads...and 75mph speeds...you're likely doing the "death-grip" as well. Loosen up. Don't try to strangle the bike, just relax and ride it; you'll be amazed how much less headshake you get.
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Xbswede
Posted on Wednesday, May 19, 2010 - 10:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Maybe wheel bearings or the tire not balanced. I had issues with mine shaking at 105 and it ended up being a front wheel bearing that was starting to go out. It was not loose but turned rough by hand.
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Motorhead102482
Posted on Thursday, May 20, 2010 - 03:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know for a fact that I do the death grip on some points of the road. It's not because I want to, it's just a natural reaction. No offense to any Italians on this website, but a lot of Italian drivers give me the pucker factor. So I know there are some times I'm strangling my handlebars like a cheating wife. haha
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