So how did the crankshaft get bent, lightning
Let me preface this with the fact that I am on dial up at the moment and the browser bounces around a bit so apologies if I post something already written as it is hard to read the entire thread continuously.
Anyway, crankshafts do not just bend by themselves. So it either got bent somehow or the crank pulley is not on straight and the wobble is from the misalignment.
A couple of ways to figure it out, simplest but least accurate is to remove the pulley and replace just the bolt, turn over the motor
and see if the bolt is spinning centered or moving around in a circular motion. If it is wobbly there then you can decide whether to see if you can straighten it yourself of if you want to send the crank out for professional straightening, rebalancing, and new bearings with a possible crank regrind. If money
is a minimal obstacle to you that is what I'd suggest doing.
If worn bearings are the cause of your wobble I'd still strongly recommend sending the crank out for an inspection
for any journal out of roundness and possibly magnafluxing for cracks.
However, if the crank has been bent due to abuse either by dropping something heavy on it or more likely someone using a hydraulic jack to lift
up and either overdoing it or forgetting to loosen a motor
mount AND funds are short at the moment or you are in the middle of nowhere, it is possible to use a jack to carefully bend the crankshaft back to center. You will need to borrow or purchase
a dial indicator with a base, but magnetic base indicators are available on ebay for $15 and up.
Straightening a bent crankshaft is not an undertaking to be casual about but it is within the abilities of most people who can pay attention to detail.