1988 kx125 parts swap

i ordered a used bottom end for my 1988 kx125 and so far so good my only 2 problem are that will tightening my water pump screw it broke inside, and i wanted to know with that screw being so small do you guys think and still use a screw extractor and get it out and i bought a flywheel remover and it doesnt work in any way it doesnt screw into anything on my flywheel

the part is this
http://www.denniskirk.com/1/1/10008...-male-mp10.html

and it a waste of time and money

well the screw didnt brake because of the threads being messed up it was because i just felt the bolt should be alittle more tight then snap but im going to buy a screw extractor and get it out and that will be one out of 3 parts or my rebuilt finished, i just need to get this flywheel off

update to my parts swap:well i was board so i decided to look in my dads bucket of bits and found the perfect drill bit to extract the screw and a small screw extractor jus laying at the bottom of my tool box so i figured i give it a try and it worked!!!!! i got the screw out of the water pump put a new one in and went to a near by motorcycle store and found a flywheel puller for 14 bucks and got that baby of in seconds now i gotta put my gaskets on her and clean the carb(just because)and i got some extra engine degreaser to make her look pretty and my project is done ill take some pics later to show you guys what she looks like

thanks for all your help guys,
yz80nbeast