You really need the battery and it must be charged..ok??
it should start without the battery, but if it does and you rev it it will burn out your $30.oo headlight.
if you unplug your headlight You might try it, but I'd wait if I were you.
Jax 182 has a great article on fixiing up garage sale expresses. do a search and print that it ..it is great
Leon with 2 expresses.