Taming vibration through handle bars.

[Noel]

Any body got some good ideas on this.
I have a CZ 360 with the original steel Handle bars with welded on perches,
after a bout 2 laps the vibration through the throttle side handle bar sends my right hand
numb which makes throttle and brake control a bit dicey .
the frequency of the vibration also negates the return spring pull which is quite strong when the engine is stopped.
any Ideas on a cure for this
Cheers
Noel

[Bamford#69]

HI Noel,
  Iv'e got a 250 and 360 and now no vibration , someone had tightened up worn out ,loose engine mount   bolts , check the mount bolt holes in frame and motor also, they may be elongated . are the steel sleeves in place .
  Has this vibration just appeared or
  has it been there for since you got the bike,or
  have you just rebuilt the motor,
  have you had this motor running without a vibration.

[LWC82PE]

you can get weights or plugs that go inside the bars ends to stop this vibration.

[Bamford#69]

Hi Noel,
one more; is the vibration more severe at idle , or worse at high revs?

[666]

Wear thicker gloves, or vibration proof hand grips, ear plugs will be a good idea too,  and take a large cardboard box with you to the next race day for the bits that fall off or out.
L O L

[Nathan S]

Alloy bars are the simplest way to reduce it. They'll also take out some of the 'sting' if you bottom it out harshly over a jump.

The newer style 'fat bars' are even better, but are a fashion crime - particularly on a short travel bike.

[Noel]

Thanks for feed back,
I was thinking Ally bars may help also thought of filling bars with resin or lead ,expanding foam, etc.

Jikov, had bike for about 9 months ,always had this vibration, fine at idle ,
I think it  is most noticeable mid revs.
did check tightness of engine mounts but have not removed bolts to check for worn hole or bolts.
will do so.
Cheers
Noel

[Viper79]

You could also try these, I have them in my CRF450 and they seem to make a difference.

http://www.fasstco.com/products/insert.shtml

[HL400]

Hi Noel I would be looking at the flywheel, it may be out of ballance,  HL

[Bamford#69]

Hi
If the bike has had the vibration since you have had it,it might be a simple as the crankshaft not in balance ,the early crankshafts are full circle flywheels, the later model "pork chop" crank rev faster but are a bit lighter, the combination of aftermarket pistons, the wrong model ignition flywheel , is possible , also if it has been assembled roughly , hammered together without heating the cases, it may have altered the "alignment" of the crankshaft cheeks.
A lot of CZ internals are the "same" ,that is they will fill the hole , but its the  combination of those bits from the other different models that make for better motors     

[albrid-3]

Cut round peices of rubber and place them between the fins.