Handlebar vibration big bore 2st

[Gibbit]

Looking to get a new set of bars for the YZ490A.

Just wondering if anyone knows which reduce vibration more, 1 1/8 or 7/8? I have the ability to use both.

I'm thinking between the renthal twinwall or renthal 7/8.

I will also pump silicone inside the bars to help reduce the vibration.

[Gippslander]

I'll lend you my 1974 450 Husky for a day and then you will be happy with your YZ 

[Gibbit]

For general riding it's pretty good. It's when I'm sitting on 120-140km/hr, the vibrations go right up to my shoulders and I can't hang on for very long.

[djr]

I have seen some modern bikes where the handlebar clamps go through some sort of rubber bush,
if you could adapt some of these to fit maybe this could work with your existing handlebars ?

[David Lahey]

You should be able to tune the resonant frequency of the bars away from where you normally ride by adding masses to the ends of the bars.
Back in the day some people swore by solid aluminium handlebars for big bore two strokes (probably because they had a different resonant frequency to braced steel bars)
It can be a real pain. One of my trials bikes vibrates my eyeballs so bad that my vision blurs up at trail riding speeds. Had the same thing (losing vision from eyeball vibration) on a mountain bike on corrugations at speed

[kim80y]

Hey Gibbit,
KTM husky dude sells bar end weights for that.
Given your intention, I would look at Flexi bars.
Cheers,
Kim

[Gibbit]

Thanks for the replies guys.

The yz490 does have rubber bushes in the triple clamps so id hate to think what it would be like without them.

I will also put some sort of bar weights in as it will need bar ends anyway.

At $500+ for the Fasst Flexx bars, they are just a bit too exxccy.

[80-85 husky]

try a couple of lead sinkers in the bar ends could help work out where to go next

[Graham]

There is a company that makes a product called Vibrenators that fit inside your bars, supposed to be tuned to the frequncy of a 2 stroke or 4, made in USA

[LWC82PE]

Looks like Vibranators are no longer made or they have no website. Struggling to find any current info/source/availability for them.

[Hoony]

are you still planning to run this at Finke ?

that is awesome.

[Lozza]

Rubber mount the engine at the front and the head stay

[Honda Hoarder]

Hey Gibbit

A few of the big bore two strokes that I have brought from the states have had lead shot in the bars

I guess they used shot gun balls to fill the bars.
Thought it might be worth a test and cheap.

[Gibbit]

Hey Gibbit

A few of the big bore two strokes that I have brought from the states have had lead shot in the bars

I guess they used shot gun balls to fill the bars.
Thought it might be worth a test and cheap.

Thanks, I have also heard filling them with silicone works so I will try that.

Rubber mount the engine at the front and the head stay

What would you use? It would be hard to do the bottom mounts as it is a tight fit between the motor and frame, but would be possible to do the top mount.

are you still planning to run this at Finke ?

that is awesome.

Yeah mate, a bit over two months before we head out.

[Lozza]

The vertical component of the engine vibration is the one causing the problem  allowing the engine to pivot around the rear engine mount is how I have done it in the past. Harley handle bar mounts are a good source of isolation mounts (but for the imperial sizing)