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#996349 - 09/07/17 11:56 PM Re: Help - High Frequency Vibration [Re: MontanaBud]
MontanaBud Offline
Member

Registered: 06/22/10
Posts: 89
This may be nothing out of the ordinary, but I did just put the bike on the center stand, started the engine, and put it in 1st and slowly let out the clutch. I heard a clatter in the lower end of the swing arm. The clatter disappeared when I twisted the throttle slightly.

Anything telling here?

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#996361 - 09/08/17 12:34 AM Re: Help - High Frequency Vibration [Re: MontanaBud]
TheOtherLee Offline
Member

Registered: 09/17/11
Posts: 839
Loc: Wilsonville, Oregon, USA
Bud -
Drained into a CLEAN pan, oil can show glitter, feel gritty. Chemical analysis can show wear in specific materials - see here for example. Blackstone Labs will give a good laymans interpretation of the results - so you don't have to be a chemical engineer to understand them.

Magnetic drain plugs can be helpful. Beemer Boneyard has 'em.


Edited by TheOtherLee (09/08/17 12:46 AM)
_________________________
-Lee, '03 R1150RT, 124K miles.
"It's all tore down"

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#996362 - 09/08/17 12:46 AM Re: Help - High Frequency Vibration [Re: MontanaBud]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 13014
Loc: Ohio
Originally Posted By: MontanaBud
This may be nothing out of the ordinary, but I did just put the bike on the center stand, started the engine, and put it in 1st and slowly let out the clutch. I heard a clatter in the lower end of the swing arm. The clatter disappeared when I twisted the throttle slightly.

Anything telling here?



Evening MontanaBud

Normal, basically just a stack up of 2 cylinder low RPM harsh firing pulses, extended drive shaft angle, & no wheel loading.
_________________________
D.R. ___
Sent from my rotory dial wall phone!

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#996382 - 09/08/17 03:35 PM Re: Help - High Frequency Vibration [Re: MontanaBud]
rxcrider Offline
Member

Registered: 09/16/11
Posts: 106
Loc: Ohio
Originally Posted By: MontanaBud

I examined the exterior of the muffler, but no signs of anything amiss there. I didn't loosen it when removing the rear tire.


If you didn't loosen it, you surely bumped it a bit with the tire along the way. As you re-trace your steps, I'd remove the muffler hanger from the subframe (bolted from the inside) and from the pin on the muffler (clip at the end of the pin) to examine the bushing which rides on the pin and make sure it isn't damaged. No guarantee that it is part of the problem, but it is quick, easy and cheap to fix or rule out.
_________________________
1995 R1100RSL

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#996400 - 09/08/17 07:48 PM Re: Help - High Frequency Vibration [Re: rxcrider]
MontanaBud Offline
Member

Registered: 06/22/10
Posts: 89
Originally Posted By: rxcrider
Originally Posted By: MontanaBud

I examined the exterior of the muffler, but no signs of anything amiss there. I didn't loosen it when removing the rear tire.


If you didn't loosen it, you surely bumped it a bit with the tire along the way. As you re-trace your steps, I'd remove the muffler hanger from the subframe (bolted from the inside) and from the pin on the muffler (clip at the end of the pin) to examine the bushing which rides on the pin and make sure it isn't damaged. No guarantee that it is part of the problem, but it is quick, easy and cheap to fix or rule out.


Okay, I removed the rear wheel, and pulled the bushing from the pin on the muffler. The bolt was a bit loose, but the bushing looked fine. I cleaned up the rubber bushing and lined it with a 5mm latex glove finger, reinstalled everything and went for another ride. Sorry to report, no change.

I think I do feel the buzz a bit more in the right hand than the left, but this handsander-like buzz seems to exist throughout.

Argh!

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#996651 - 09/11/17 09:23 PM Re: Help - High Frequency Vibration [Re: MontanaBud]
Dobo Offline
Newer Member

Registered: 05/01/17
Posts: 18
Loc: texas,USA
Would bar backs or the risers exaggerate this issue ?
mark

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#996653 - 09/11/17 10:17 PM Re: Help - High Frequency Vibration [Re: Dobo]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 13014
Loc: Ohio
Originally Posted By: Dobo
Would bar backs or the risers exaggerate this issue ?
mark


Evening mark

They can sure effect it, depends on how it effects/changes the excitation periods. Might make it worse, but could just as easily make it better.

On the 1200 hexhead I actually remove the 4th handlebar attachment bolt (only use 3) then space the bars up on very thin stainless washers to provide a tuned hinge point. That tuning coupled with heavier bar end weights changes the tuning enough to allow most of the boxer buzz to dissipate & not get to my hands.
_________________________
D.R. ___
Sent from my rotory dial wall phone!

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