I'm rebuilding a Wizard WF-4 Super Twin sn#385230 and need a recoil spring or a complete assy. I would consider buying a motor for parts. This is a great website, just bought an impeller from Brian Wilcox found through your site.
If the problem is the end is broken off the spring it is possible to heat and
bend end of spring. It is also possible to attend a large outboard swap meet
and source a spring from one of the many models of Kiekhaefer Mercury/Wizard
that share the same spring. For an outboard used lightly a used or reworked
spring is more than adequate imho. Each of us must do our own cost/benefit
analysis to decide which needs to be new and which items with prior service
can be accepted. Sometimes the choice is easy...new does not exist..
At the Constantine Super Meet Saturday I scrounged for parts for my early K Model accumulation. A walk and look thru the swap area netted a couple of rewind covers for green tank Mercs....complete with springs for a modest sum.
Seek and ye shall find at a reasonable price.