Bar Ends on a 3CL

G

ghwallice

Hero member
Location
Ipswich
I've recently tipped the bars up and back on on the dog to give me a more portly grandpa style upright riding position. Unfortunateley I've had to scrap the mirrors and start again. I've machined up posts ectect but the best position for these mirrors overhangs the bars by about 30mm. Easy fix, I just machine up a set of bar ends to suit,

BUT: I've spent a lot of time on the Ducati forums around fitting ape hangers to my 999, and it's not simplistic.
1) bar end weight has imact on handling.
2) bar end weight has impact on vibration

So, I don't know where to go...
Since doing the clutch plates, primary chain, cush rubbers, new chain, bar vibration is very noticable up to about 110klm/hr.
The bike still weaves a bit, but Uncle Cosi reckons it the tyres.

My reading of the Ducati forums is that they use anything from no weight to weighted, and the harmonic resonance issues can be solved with anything from pumping the bars full of silastic to rolling up lead and pushing it up the bars with silicon to hold it in place.

Advice would be appreciated.

Regards, Greg







 

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Adding mass to the end of the bars will lower the bars natural [spring if you like] frequesncy - the goal being to move that natural frequecy below the excitation  frequncies coming from the motor. If you want to do that....

Step 1 - reduce the excitaion amplitude as much as possibe - balance carbs, ignition timing, compression comparisions, etc, etc.
Step 2 - make an adjustable bar end weight - put a plug in the bars into which you can add a screw that holds on washers - keep adding more washers until the vibes are acceptable to your hands. Then make a sexy bar end to that mass.

the other effect of mass here is that it gives rotational inetria around the steering stem - so it will be 'harder' to steer - more force needed - either throught your hands or the bikes natuarl dynamics.

There is NO standard answer - it depends on the bike and you.

P
 
I have tried everything know to man to reduce bar vibs, weighted inserts in the bars, bar end weights, some secret silicon stuff from bar snake injected into the inner bar through small holes I drilled, gel padded glove palms and probably a few others I forget, but the best fix is an expect an expensive crank job that's the best fix. Second to that are foam grips. The gloves were good as well but the rest didnt do much at all. If adding a few ounces to the bar ends stuffs the handing it must be balanced on a razors edge to begin with.
 
Paul H said:
Adding mass to the end of the bars will lower the bars natural [spring if you like] frequesncy - the goal being to move that natural frequecy below the excitation  frequncies coming from the motor. If you want to do that....

Step 1 - reduce the excitaion amplitude as much as possibe - balance carbs, ignition timing, compression comparisions, etc, etc.DONE to the best it's going to get at the moment
Step 2 - make an adjustable bar end weight - put a plug in the bars into which you can add a screw that holds on washers - keep adding more washers until the vibes are acceptable to your hands. Then make a sexy bar end to that mass.Good advice, will follow through with this

the other effect of mass here is that it gives rotational inetria around the steering stem - so it will be 'harder' to steer - more force needed - either throught your hands or the bikes natuarl dynamics.And this is where the Ducati forum came unstuck

There is NO standard answer - it depends on the bike and you.Correct, but I need advice to start somewhere, hence the post

P
Click to expand...
 
Starting to sound like fuckin' rocket surgery... ::)

To reduce vibes on long, high handlebars on a 4-stroke thumper, I've inserted a length of rubber hose into each end and screwed a big allen bolt into that, worked nicely.  I do doubt that the short and sturdy Laverda Jota bars will be greatly influenced by something like that.  Many blokes here have bar-end indicators fitted to their Jota bars, tbh, I've never really felt any difference.

Want to get rid of vibes?  Have the crank overhauled.  You'd be amazed at what a set of new bearings can achieve!

piet
 
Here are the bar end weights I had on my 180.  Weighed over a pound each and didn't affect the vibes (short bar - may work on longer ones), handling or ability to pull massive wheelies one iota.  I just fitted them because they looked good.  180s don't need to vibrate - mine was very smooth, good crank I guess.

Improving012.jpg
 
I,m getting to old to use the clip-ons , so i removed the fairing and the clip-ons and fitted a normal handlebar and
made theese barends and fitted this little barend mirror at the same time, Works good .
 

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Manufacturers spend a lot of time working the correct bar weight for each bike.

Many variables, bar length, material spec, tube spec(size) plus many others all
matched to a certain model.

Using non standard bars means trial and error to get it right, took me ages on
my Bandit fitted with Renthals to dial out the vibration.....but worth it.

Andy
 
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