Gear puller

[ZQQH6]

Anyone know what size jaws are needed to pull crank sprocket?
Thanks

[Y2Kvert4me]

The crank sprocket is relatively small, maybe 3" dia. But what you do need to get behind it is a puller with a lot of reach (depth).
I'd guess 6" reach or so, as the sprocket sits quite a ways back from the front end of the crank. (going off memory here).

Which generally means you'll need a larger puller that probably also has the capability of grabbing something 8-10" dia. or so (which you don't need, but a big puller will still grab small stuff too).

Alternately, a slide-hammer would probably work too with a single hook-end behind the sprocket.

The sprocket usually isn't that tough to get off, it's by no means a press fit, it's keyed to the crank with what I'd call a snug sliding fit.

[Y2Kvert4me]

These 2 pics may be of some help to you too...