Early flywheels

I'm trying to true a set of early K Model press together flywheels, and I've got a problem with parallelism. The center shafts are .005" out, and the wedge/clamp/hammer technique produces no results. Is there a trick, or should I simply hit the wheels harder?

[Pa]

Disassemble...look for burs and high spots and then lap the tapers in before assembly, then re-try truing them.

Early flywheels don't have tapers.

Hi Larry,

Wedge and hammer techniques won't work with parallel interference fits when they are fully seated... I seem to remember the K pin interference is around 6 thou. At 1 ton effort per thou, that's around 6 tons...

You'll need a holding fixture that will ensure crank wheels are dead parallel before pressing them on the last shaft. See some H-D alloy XR manuals for illustrations and adapt the technique to your K Model.

An early Iron Sportster crank, same stroke but tapers and nuts..., can be made to fit in the K cases, but some machining around the cam bore locations is required...

Patrick

[Pa]

Oops !! Shows how long it has been since I was into a K model bottom end. I still recomend checking for burs or distortion in the shafts or bores though, The amount of out of alignment points my opinion that direction.

[Pa]

Seems I replied just about the same time as you did Patrick. Great explanation Bro !!

Thank you both for the advice. The wheels were already assembled, limiting my choices. A steel wedge and a BFH brought the shafts to about .001". Next time I'll use a little less force and a little more finesse.