Manual for old craftsman?

[Bensawsome]

Hello,
I was just given an old Craftsman Eager 1 model number 131.908020 lawnmower by someone and I want to get it going but I would like the manual so I can make sure I'm doing some of this stuff right. I tried googling the model number but was unable to find a manual or even maintenance info or a video about it. Anyone know where I can get a manual or any resources about getting it going again? The main things I need is the fuel type, oil type, and the spark plug type and gap. I put a photo of the mower below in case that helps at all.
Thank you.
EDIT: I just saw the link to repair manuals on sears parts direct and while it found the model number there was no owners manual unfortunately.

 

[mechanic mark]

Craftsman 131908020 walk-behind mower parts | Sears PartsDirect

Craftsman 131908020 walk-behind mower parts - manufacturer-approved parts for a proper fit every time! We also have installation guides, diagrams and manuals to help you along the way!

www.searspartsdirect.com

locate all numbers from engine & post them, thanks, Mark

 

[Bellcrank]

Greetings. Not sure on the mower manual. Looks like a Tecumseh engine. Think'n tecumseh model number should be located on engine shroud above spark plug. First 3 digits 143. xxxxxxx. Plug RJ19LM, .030 gap. 30w oil in the summer. Make sure cool'n fins are mouse nest free. Not sure on the air filter.

 

[Telesis]

You can locate the treasure-trove of Tecumseh manuals here:

Tecumseh Service and Repair Manuals

Find Tecumseh engine repair manuals, reference charts and other service manuals in PDF format below. Tecumseh Reference Charts and General S...

www.barrettsmallengine.com

May I suggest you specifically look at 1) Basic Service and Troubleshooting information, 2) 3-11 hp L-head manual(this is the Technician's Handbook), and if you 'veg' out on carburetor stuff, then 3) Carburetor Identification, Troubleshooting and Service Manual

#1 above should suffice for what you need. Hope this helps!

Good luck!