In reply to Skeptic.

The way we used to do it on the pre-Twin Cam and Milwaukee Eight motors was to drill reliefs in the meaty section along the outer edge of the flywheels, as shown here. I have no experience of anything past the Evos, never have worked on those. They’d have to be a lot roomier than the older motors, though, there ain’t enough space in the old cases to hang counterweights off of anything.

I’ve always said that the Evos were the best motors Harley ever did make, or ever will make, and still be a honest-to-God HD motor. Got no interest at all in the latter day types, although I do know people that run ’em, and swear by ’em. I will allow that the inject-oil-onto-the-piston-skirts idea they implemented on the Twin Cams was a great one, however.

Error happened.