Flywheel Crankpin Key Question

[BigLakeBob]

Can someone educate me on why a BT OHV (maybe BT SV too?) has the crankpin key on the right flywheel and a 45" SV has the crankpin key on the left flywheel? I would think the right would make more sense to ensue line up of the oil feed hole. I know the wheel shouldn't be rotated enough to matter, just curious as to why the difference.

And a follow up question. It seems like HD OEM nut to shaft fits (concerning flywheels) are very tight, (not a hand assembly). I compare a new 'Jim's' shaft and a new Colony nut and the assembly is a fit like (me being a machinist) would fabricate. Sometimes the Colony nuts are too tight on an OEM shaft, same as oem nut to shaft fit. Is the opinion that HD made their shaft threads on the larger side of the pitch diameter for a very tight fit or this just happened through production tolerances? I just hate threading a nut on with a wrench from the get go. Opinions?

Thanks.

[exeric]

From my limited experience; I would want the nut to fit precisely (not tight, not loose) on a crank pin, sprocket shaft, and pinion shaft. H-D provided retainers to keep the nuts in place. Excelsior made (one side) interference nut to axel shaft fits which worked well for the rear wheel application, and also on motor mounting bolts. Again, I wouldn't like tight fitting nuts along with all the other aggravations of assembling, and truing flywheels.