89' RM 125 Crank Removal

I recently pic'ed up a 89 rm 125 that was supposidly rebuilt on top and bottom end but got 2 hrs on the trail and 2 miles in and the bottom end let go!
I am now trying to rebuild it now, cylinder is has been sent to get bored out for new piston and ring and have gotten the case split but the crank is stuck in half the case ! Just wondering if you have any suggestions to get it out. hitting with a rubber mallot doesnt do anything, and I dont wanna crack the case, the other side came out with ease.

Still not sure why it failed, was really gutless down low but wasnt sure if that was normal with this bike or not, I was told that 125's were so didnt think much of it

I'd post a pic but cause I am a unable to post link

Heat and press it out heh - I kinda figured it would need that.

I dont have access to a press so I am gonna take it all down to local bike shop and get them to do it, they have to get the crank pin pressed out anyhow to replaced the bearing & rod

I will pick up a plastic mallet and a torch and give it another try on the weekend

thanks for the help