| Author |
Message |
    
Conchop
| | Posted on Wednesday, August 05, 2009 - 09:50 am: | 
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I am getting ready to do my 10K service on my Uly. I have had a problem with a very harsh vibration between 2500 and 3000 rpm.
Here are the qualifiers -
It is at its worst when she is fully up to temperature.
It is negligible once the motor rests and the fan runs out
It becomes harsh again within just a few miles.
The vibration is worst in the handlebars
Here is what I've done with limited success -
Silicon in the handlebars
Handlebar weights
Tighten the primary chain [ big help ]
Irridium plugs
Occasional TPS adjustments
Replaced front isolator
Synthetic oil.
Occasionally lubricating the heim joints.
The seat touches the rear jug - wore a hole in the heat blanket - separated the 2.
Latest download
Halved grip puppies
Questions - Has anyone else had this issue with the 08 or 09?
How did you fix it?
Is there anything bouncing around and hitting a hard part under the air filter pan?
Statement - The dealer has had it twice. Harley's shake and its a matter of status quo to the faithful.
I have been told to keep it over 3k rpm's which I try to do BUT once you chop the gas for a curve, there is little sense to downshift as there is plenty of torque to pull you right back up to 35 to 5K rpm. I am reminded of riding a 125 MX bike. Having to keep a big V in its upper rev ranges to achieve comfort is not right and it ruins the overall drivability. At 4k rpm, the world is sweet. 4K rpm on a little one lane back road is a hot and nervous experience. GOing to 2700 rpm is reasonable BUT its like holding on to an old cheap busted up lawnmower.
Any idea's?????
PS I have a comfort kit on order. What an ironic name! |
Buellisticx1
| | Posted on Thursday, August 20, 2009 - 07:32 pm: |
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Maybe worth checking the rear isolators of the swingarm
If you have recently worked on/changed something, re-check your work.
Just a thought. |
Pontlee77
| | Posted on Friday, August 21, 2009 - 04:43 pm: |
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maybe needs updated ecm maps , there was a great deal of problems with the 08 maps, seems the 09 maps work much better, but this is just a guess. |
Blake
| | Posted on Friday, August 21, 2009 - 06:33 pm: |
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What are you comparing the Uly to in the way of vibes? There is a resonance in the range you mention, 2500-2800, but without knowing what your sense of "very harsh" really means, it's tough to say.
If the primary chain adjustment made a significant improvement, then I think you've identified one likely cause of any excessive vibration.
Does the bike run well?
Check all the exhaust tracks fasteners and brackets and their fasteners, including the header nuts at the cyl heads.
If all that checks out, have a leak-down test and a compression test done on each cylinder. Be sure they are done while the engine is still good and hot.
Let us know what you find. |
Fireman_cfd
| | Posted on Monday, September 21, 2009 - 12:51 pm: |
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Ever check your rear wheel bearings. I read a lot of people r replacing those very early. Just a shot in the dark. Or maybe a air leak in the intake. |
Husky
| | Posted on Monday, September 21, 2009 - 04:47 pm: |
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I had a vib problem with my 08
XT that I could not seem to adjust out. A comment at the top of Knowledge site http://www.badweatherbikers.com/buell/messages/384 2/4010.html?1253443742 helped me fix it.
comment quotation: "Please learn this... Don't even think about overtightening your chain. Wise folk suggest setting the chain slack to no less than 5/8" and closer to 3/4" total up and down play when the chain is in its most taught position."
I was not checking enough places on the chain to really find the tightest location. So with the bike cold on a lift and in 5th gear, I rotated the tire ~3 spokes each time for 8 times and found that the difference between the loosest and tightest was ~3/16", which was a big surprise to me. I took the above recommendation and set the play to 3/4", cold at the tightest spot, and the vibration went away.
Husky |
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