an easy, cheap way to break an old piston pin out to replace the head ( big bore kit users for dirtbikes use this technique a lot)
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2 washers (I only have one shown but i wish I used two :-( )
one hexagonally headed threaded rod 1/4" by 3.5-6.5 (depending on the size of piston you have)
a nut (the thicker the better)
one or two sockets that will allow the threaded rod to pass through
a deep well socket to turn the threaded rod
for really badly stuck ones you may need vicegrips/pliers
put the rod through the hole in the piston ring, making sure the head is in contact with the rings surface
put a socket (with the more open end) facing towards the piston pin, being sure that the opening is large enough to fit the pin inside
put two washers on the other side of the socket
and lastly put the nut on the threaded rod
use the deep well socket fitted to the threaded rod to tighten and extract the piston pin
if the rod starts spinning, switch to vicegrips on the nut and use vicegrips to keep the rod from spinning
if all fails, use a heat gun to get the head hot and expanding