Is there any type of 19mm bit you would choose to crank the engine?

Is a deeper bit better?

Are you trying to START the engine?  Or just turn it to say, adjust the valves?


Cookie

Any socket deep enough to seat fully on the nut is deep enough to turn the engine.

Or am I missing something?

You can also use the wrench in the tool kit 

well if you just want to turn the engine to adjust the valves...you can put the bike into a high gear...and just turn the rear wheel to get the camshafts where they need to be.  I just did that job day before yesterday!  Had do go down one size on one exhaust valve.



Cookie

you are considering to remove the ignitor cover to rotate the crank right...?

To be honest any wrench do the job easily.



cheers