Author Topic: Curing handlebar vibration.  (Read 276 times)

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Offline John Orchard

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Curing handlebar vibration.
« on: September 16, 2018, 03:32:18 PM »
Yes there are few ideas for curing handlebar vibration (once engine mounts and swingarm are tight), lead bar-end weights work for sure but for off-road use l don't think it is acceptable.

I have tried previously to fill the handlebars with silicon but it didn't seem to improve matters, that being said, l have just filled another set of bars to try again. I think l'll be waiting a long time for the stuff to cure though :-(

I'm thinking l should have filled a length of rubber tube (say 8mm) with silicon, then slide the tube through the bar, then fill the cavity between the rubber tube & outer steel tube. This will keep the silicon thinner, hence quicker to cure, though l don't know if cured silicon has better vibration absorbing qualities than uncured?

Anyone had a good a good fix on the issue? Also, anyone know what silicon cures without contact to air?
Johnny O - Tahition_Red factory rider.

Offline tony27

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Re: Curing handlebar vibration.
« Reply #1 on: September 16, 2018, 05:18:59 PM »
There used to be foam filled bars on the market, basically filled with space invader

Offline John Orchard

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Re: Curing handlebar vibration.
« Reply #2 on: September 16, 2018, 08:35:19 PM »
Maybe lead-shot pelletts in the end of the bars? Anyone know where l can buy lead-shot from?
Johnny O - Tahition_Red factory rider.

Offline GMC

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Re: Curing handlebar vibration.
« Reply #3 on: September 16, 2018, 09:32:01 PM »
From the wacky inventions thread from years ago.



Seen at Broadford many years back


Have you thought about having the balance factor of the crank looked at?
Better to fix the problem than hide it
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Offline John Orchard

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Re: Curing handlebar vibration.
« Reply #4 on: September 16, 2018, 10:13:44 PM »
But doesn't balancing a crank on a single cylinder only smooth it out at a particular rpm? So either side of that rpm it will vibrate?

Surely the manufacturers know the weight of pistons/rods/used rpm to get it correct in production?
Johnny O - Tahition_Red factory rider.

Offline Lozza

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Re: Curing handlebar vibration.
« Reply #5 on: September 17, 2018, 10:38:51 AM »
But doesn't balancing a crank on a single cylinder only smooth it out at a particular rpm? So either side of that rpm it will vibrate?

Surely the manufacturers know the weight of pistons/rods/used rpm to get it correct in production?

Yes that is correct, however there are a few other factors the angle of the cylinder, closer to 90deg verticle the higher up the rpm scale the vibes move to closer to 90deg horizontal the lower down the rpm the vibes move to. That should dovetail with the balance factor ie big bore should mover the vibes up to 8-9000rpm and a 85cc down to 5-7000rpm 125cc cylinders are tilted forwards more than big bores

Tungsten is far more dense than lead and should stop 80% of the vibes at the bars, the most effective is to rubber mount the front engine mount(s) and the head stay, so the engine can move slightly in the vertical plane. They are the damaging vibrations and the ones you feel the most. The vibrations sap energy and concentration from riding.

Manufacturers aim to sell new bikes and curb warranty and liability claims :-)
Jesus only loves two strokes

Offline 80-85 husky

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Re: Curing handlebar vibration.
« Reply #6 on: September 17, 2018, 12:03:39 PM »
have a look at cafe husky John, there is a series of post from a guy in qland who had a filling rattler husky and he sorted it...lots of crank info and other things to do...you will have to search it to find it..it was a few years ago....

Offline John Orchard

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Re: Curing handlebar vibration.
« Reply #7 on: September 17, 2018, 09:24:25 PM »
have a look at cafe husky John, there is a series of post from a guy in qland who had a filling rattler husky and he sorted it...lots of crank info and other things to do...you will have to search it to find it..it was a few years ago....


Thanks Guy's :-)  l started my CR500 today, filling the bars with silicon has cut the vibes by about 50%, l'll have a test ride and see how it feels. Jodie (my partner) works at a transfer-station, she brought some lead home today, l might ram the last couple of inches of handlebar with it for another test. I'll let you know how it goes.
Johnny O - Tahition_Red factory rider.

Offline dont

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Re: Curing handlebar vibration.
« Reply #8 on: Yesterday at 08:49:42 AM »
I had some solid aluminium bars that were brilliant at stopping vibration (but were flat bars so did stay long ). I've never seen another pair but I guess thick walled alloy bars will be similar?

Offline suzuki27

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Re: Curing handlebar vibration.
« Reply #9 on: Yesterday at 07:39:18 PM »
Most of the old RM's had engine bolts that were too small in diameter for the case holes. The fix was to re drill the case holes and match with correct diameter bolts. It works in reducing vibration.
Maybe consider lead fishing sinkers as an easy buy .