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Buell Motorcycle Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through May 22, 2008 » I'm picking up WIERD Vibrations... « Previous Next »

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Uly1080
Posted on Tuesday, May 20, 2008 - 04:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I'm starting to feel a strange vibe around 3500 RPM, which kinda feels like knobby tires. It seems to surge a couple times while in that RPM region. My tires are just the opposite of knobby, they're worn out Scorpion Syncs, so could they be the cause (I'm getting ready to replace them)? Front isolator looks fine, AFV and maps are good, and this is not high freq buzzing, but more like I'm running over those highway strips (when you're getting ready to run of the road), only not quite that bad. At first I thought I was just imagining it, but now I'm pretty sure somethings off...any thoughts?
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Bigkuri
Posted on Tuesday, May 20, 2008 - 04:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Front engine mount - even if it looks ok like you say?

Or a wheel balance weight that has been thrown off.
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Hughlysses
Posted on Tuesday, May 20, 2008 - 04:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Pull in clutch and coast and see if vibration changes or goes away. That'll help you match it to engine or wheel/tire issues.
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Etennuly
Posted on Tuesday, May 20, 2008 - 11:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Yes, a good test to is run it up to speed pull in the clutch and shut the engine off. Vibration gone = front motor mount gone(in most cases).
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Longdog_cymru
Posted on Wednesday, May 21, 2008 - 05:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Yes, a good test to is run it up to speed pull in the clutch and shut the engine off. Vibration gone = front motor mount gone(in most cases).

+1
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Uly1080
Posted on Wednesday, May 21, 2008 - 07:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Thanks for the input everyone, I'll try to diagnose it this afternoon.
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