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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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bushings, handlebar, numb, poly, vibration

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  #1  
Old 11th August 2019
Maxeffort's Avatar
Maxeffort Maxeffort is offline
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Default More handlebar vibration with poly bushings???

Should be “With” poly...

My 1996 has always had considerable handle bar vibration. I had replaced the worn bushings with rubber a year ago and it helped a little.

My bars were the OEM originals, with 4.5” straight risers and GT grips.

I just changed the setup to Chump style bars (short mini narrow apes) short risers and red poly bushings, same GT grips.

The handle bar vibration is just BRUTAL. I just went out for a one hour ride and came back with numb white fingers in 80 degree F weather.

I think the riser bushing are isolated, the washers aren’t touching the triple tree or anything like that. IDK if it’s the bushings or the bars, or both.

I just read some of this thread and am considering some of the mods. The thread is 10 years old though.
http://xlforum.net/forums/showthread.php?t=448758

Do you folks have any comment or suggestions?
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Last edited by Maxeffort; 11th August 2019 at 19:54..
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  #2  
Old 11th August 2019
Tomcatt Tomcatt is offline
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Default

A traditional "fix" is bar end weights. Just a piece of steel round stock slid into the bar end and welded. We'd save crash damaged bars with weights so we could cut the welds and re-use the weights in bars that didn't come with them.

If you do a search for "bar end weights" you'll find the aftermarket has lots of different flavors available.
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Old 11th August 2019
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Go back to stock rubber type!
I would think hard poly bushes are a no-no.
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  #4  
Old 12th August 2019
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Default

The poly bushings made the vibrations much better on my bike going from the stock drag cars to carlini t bars that are 32" wide 6"rise and 4" pullback.

Some people have glued rolls of pennies in there bar ends to help the issue your having many use the vibrinators sold by ricor.
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Hammer 1250 kit W/ 30° reverse dome pistons, billet 2.25" crush forward offset open air cleaner, billet intake manifold, Impact 560's, Sledge Hammer pushrods, Buell XB heads with crush level head porting, Mikuni HSR 45, 177.5 main, 25 slow, Clip 4th slot from top, Jim's powerglide II lifters,
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  #5  
Old 31st August 2019
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Default

I installed a 6" lenth of 3/4" mild steel bar into each handle bar end. Still had numb fingers after one hour.

I reinstalled the rubber Bushings (one year old) and now it's better then it ever was with the combo of rubber and weight. A three hour ride today was ok.

The urethane bushings I put in are very hard. They might as well be solid hard nylon. I see the urethane bushings Harley sells are "37 percent stiffer than stock". The red urethane bushings that I installed are like 200% stiffer than stock.

I'm glad to have my flexi handlebars back!
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