There is a split though, the softails use the 88B, which has chain driven counterbalancers, the dynas and touring bikes are rubber mounted.
The good news is that you have more engine options now. You can get the same engines in 88", 95", 103" and even a "race only" 120" version.
Bzzzzt oops
Counter bored flywheels with 2 half-moon shaped, free spinning counterweights that negate the flywheels own vibration via the kinetic force created by that vibration.
This is getting to be fun. :-)~
Everything I said in post #139 was incorrect.
I stand corrected and bow my head in shame.
Chain driven counter balancers as you said is correct.
(I was very vigorously educated a few hours ago)