Snapped a few shots of the old B&S book.
First pic: Valve clearances. Notice the aluminum and cast iron have different clearances.
2nd pic: a shot of the codes and their meanings.
3rd pic: the clearance/gap for coil laminations to flywheel.
4th pic Carburetor identification. I'll bet you have the Flo-Jet two piece.
5th pic: notice the emulsion tube and adjusting screw (yellow outlined area)
go all the way into the top of the carb body (purple looped area)
Most of that top comes off as a unit
BUT you have to unscrew that mixing tube assembly to remove the top
otherwise you will bend it if you force the top off
without first removing the tube and screw .
I saw a few in the shop that were damaged in that way and the kit to repair it
was 35~40 dollars 25 years ago.
I'll wager it's a scarce item by now.
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on the spark. I allways test with a clip on plug like the one in this web pic.
http://ww2.justanswer.com/uploads/mobiletech/2012-02-07_223236_spark-tester.jpg
if the spark jumps that (bout 1/4"), you're probably in good shape for ignition.
haven't seen one pop that gap and not run with a good spark plug.
If I missed a page or the pics aren't clear, let me know and I'll try to get better ones.