Rebalancing engine and retaining balance shafts

[harlton]

 Hi Guys,

            New to forum so hello to all, I am building a 650 engine and putting it into a 500 frame.  I am lightening the reciprocating parts and crank to suit. I have the 500cc engine and the 650, so I will carefully weigh all the parts before I go any further.  I am hoping to get close to the 500#'s with the new and modified 650 parts. I have done this work  on other bikes successfully in the past, just not with the added complication of the balance shafts.
      My question is, if I take a proportional approach to this, can I rebalanced the now lightened parts balance shafts to suit.  I have nerve damage in my right hand and cannot handle the excess vibration, dead hand no brakes. Are these shafts optimised for a particular frequency to suit the frame or done to a formula to offset the secondary forces.
      I would appreciate hearing from anyone who has rebalanced the assembly including the balance shafts before.
      I will be statically balancing this to start with, followed by dynamic  balancing, and reducing friction on shaft balancer journal surfaces. So I am hoping to account for extra momentum of the shafts, from other places.

regards Ian