What spark plug would me Sears 3.5 take ?

[333Fitter]

It's a 3.5 Tecumseh
model # 217-59860

 

[racerone]

Rj12c ??

 

[Edchris177]

Here’s a manual that should be applicable to your powerhead.
https://www.smallenginesuppliers.com/html/engine-specs/tecumseh/Tecumseh_2-Cycle_Engines_Service_Information.pdf

Heres a thread, call the 1st link with questions.
http://www.marineengine.com/boat-fo...ard-spark-plug&highlight=spark+plug+Sears+3.5