Well well.... you are in luck.
I just rebuilt mine. On the Sears IPL, the washer thingy that is not labeled with a # is actually a 1/8" (or 1/16", can't remember) thick felt washer. This saw will always leak oil, no matter what you do - due to it being made of black plastic and where the air-valve for the tank is located. It can also spit gas up where the carb box/air filter is. If you use a el-cheapo primer bulb, make sure the long straw goes to the tank, or you will simply flood the engine. If there is gas in the primer bulb, I usually only push it twice. The engine will not run in full-choke position (read the manual)
Protip: Do NOT disassemble the 'incredi-pull' recoil starter. (and if you can do me a huge favor, just show me the rope-side of it, I can't find a pic of it anywhere online). And don't jerk it like you would a normal recoil starter, just use mild force and draw the string out its full length. Yes, that is how it is, no noticeable resistance until the last 1/5th of the pull length, then it turns itself over 3x.
Saw is a BEAST with oregon's narrow-kerf chain. Keep in mind there was a recall on these saws for the front handle breaking due to manuf defect (plastic wasn't mixed right), wrapping a steel wirecable from antivibe screw to antivibe screw is a good safeguard.
I have a few manuals and IPL's I found, if you need them. Apparently McCulloch made a 'brother' saw to it, as seen a few posts above.