What crankshaft type?

[Minimichael]

If the head is still original, MOST of them had the CID number cast into them.

I'll look closer...

 

[Minimichael]

Here are the shroud stamps from each of the green machines:
Last year's find is date coded "900127",
while the newer one is stamped "921026". So, both of these lil' zappers came from assembly plant #27 just about 2 years and 10 months apart. Might even have been built by the same employees.

 

[Denny]

But does it make usable electricity?

 

[Sparkwizard]

Those simple old Coleman generators are great for job sites and remote locations. The small tank only runs about 2 hours, but for power tools they are great. I would check the output and keep the generator that works better; use the other engine for a kart or bike.
Those numbers are date codes. the 13xxx is the engine type.

 

[Sparkwizard]

I do have a ball bearing crank with bearing and side cover to fit it, but it will need the newer starter, like I think your 1992 engine has.
It won't work with the old starter with the square starter clutch holding the flywheel on.