Hi Mitch and Bushie,
Sounds like a bit of a plan. I pulled it apart to see what was broken. Sounds like it needs special tools to fix, I have the gregory's manual and it has a pic of a special crank tool, I might sit that in the too hard basket and look out for a working one to swap the head onto. I am guessing that you wouldn't even know if the balance was right on the crank until you started it up.
I'll move onto painting the base and handles and cleaning out the tank and carby. The underside of the base looks like it has not done much work, the motor must have cracked it fairly early in its life and it just sat around until someone eventually took it to the tip.
If anyone on the north side of Melbourne or Central Vic has a working 80 series points type motor that might be a good candidate to become a HC160 on a Utility, please send a pm!
Thanks for the input!
B