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Thank you so much for sharing your knowlegdeYou have an 1987 , https://www.marineengine.com/parts/mariner-outboard-parts/4a/6e0001011-and-up-m . If there is a Yamaha dealer anywhere near you they will be able to help as well as this is a Yamaha 4 painted in Mariner colours
Thank you so much, its a great helpYep. 1987 model year motor.
Equivalent to a Yamaha 4SH/4LH. www.yamahaoutboards.com
Yamaha owner's manual can be obtained here. https://www.yamahapubs.com/home/search?category_id=4&year=1987&family_name=4LH
Air/fuel ratio is 100/1. Oil type is TC-W3 two stroke.