Isolastic handlebars

I have flat bars on my 99 and it's not too bad, but I have also tried the riser bars like yours and suffered from the annoying vibrations and white finger.  My cure was to buy a kilo of lead shot and pour it into the bars and seal both ends.  The bars now weighed about 40 times what they ought to ;) but what a difference to the nasty vibes.    I have subsequently returned to the flat bars for authenticity's sake on my 99, but for comfort's sake I may well be refitting the riser bars in the future and if needs must will look into a rubber mounting either like yours or like the BSA/Triumph P clamp. Sacrilige to drill the top yolk though.

Hello well I own a very early Norton Manxman 650  and it has 8 inch high bars as standard  and there is not much in the way of vibration going though these handelbars  and I own a 1954 Dominator it has Rubber mounted handle bar set up  as Standard  so may be you can use this set up from a !954 dominator  head stock  and bar mounts  ,  Now many of you hate high bars  but who is having the last laugh ,So give me eight inch high bars any time,   I have had clip ons and flat bars  you can keep them , there for sadists!  that like vibs though there bodys To Me the high bars give you a nice  look and good for just enjoying you ride out  with the wind in your helmet  pudding basin one fit blue lenses on your glassis you find you see better,  you can just enjoy your ride at road speeds with out breaking the law  and speeding,  at high speed  we all been there and broken the speed laws  and got away with it many times  but ther comes that day when you get court out  So do try not to ride like a loonatic Has we did when we were younger     and stay safe    yours  anna j

I am wondering whether the vibration is caused by the new pistons, which I assume you fitted when the engine was rebuilt. Some of the available pistons are much heavier than the originals, messing up the balance and causing serious vibration. A member posted recently that he had this problem, which was so bad he had to dump the new pistons and get new ones of a different make. I have a 650SS-engined Wideline which I rebuilt with BHB pistons, and despite have flat alloy bars, do not find vibration intrusive; unlike my T110.....!

Maybe investigate the source, rather than masking over the symptoms?

Ian

Quite often, when owners fully rebuild their engines they fail to notice that they are fitting replacement pistons that do not match the weight of the originals. I have come across some replacement pistons that were 30% heavier than the original set. Consequently building an inbalance into the engine. It always pays, with all the 650 and 750 motors, to have the crankshaft reblanced to match any change of pistons.

More recent handlebars tend to be thinner-walled tube in my experience with stainless bars being the worst offenders in this regard.  A change of bars, even a similar pattern might make a difference.

...and a rebore will lead to heavier pistons.. 

The 1954-5 bikes had rubber mounted handlebars, but you will not be able to fit this top yoke to your '60s bike - assuming you can find the parts.  The yoke width was increased from 7" to 7 3/8", so they do not interchange.  There were lots of other changes to the forks, such as sliders with a longer lug to engage the brake plate.

Paul

I have read in the past that some riders have had success with stuffing the ends of the handlebars with lead of one kind or another.

Had to do with changing the frequency resonance???

Can't hurt to give it a try as it is a reversible option

Mike