Cylinder

[wyatt emp]

What is the standard cylinder ID for a JD 74?

[sirhrmechanic]

I think it's 3.440 bored diameter x 4" stroke. But that's from memory, so I could be off.

Cheers,

Sirhr

[Steve Slocombe]

I reckon 3.442" at the top and 3.429" at the bottom, as the cylinders were taper bored. Note that Harley reported this as 3 7/16" bore and the manufacturers of repro pistons made them to this measurement, thus being 0.0155" bigger than original, including the oversizes.