Whoa!! No tool is needed. You need a puller to remove the flywheel but you're past that.
When I do them they slip together without any pressure.
You're going to bend the crankshaft if you press it together. It'll have a vibration.
I sand the main bearing contact surface of the crankshaft in my lathe till the bearings tightly slip onto the crankshaft. Then I heat the cases up and install the bearings.
I also clean up the dowels.
IMO if you have squeezed it any you need to take it apart, make sure the crank is still straight and do the above.
814-922-7470 if you need more advise.
It'll slip together very easy when done correct.
BTW: welcome to the forums.
2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05