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09789707 seems to be a 4-HP Engine?? as you didn't mention the HP which helps us.
4-HP Serial Number Range 09710000 - 09792524 = 1993
If it's a 4-HP, The Model Number is 7004201BB 'Which comes up as an MARINER BELGIUM 4 MH
This parts guide should get you close enough for your model, https://www.boats.net/catalog/mercury/outboard-by-year/mariner-outboard/1993/7004201bk
HI looking for some information on my Mariner, secretly a Japanese built Yamaha? It's a 40E, so I know it's electric start and L for Longshaftt, serial is 411665, looking for year, it needs an impeller. Also if anyone has any idea what the gap is on the spark plugs that would be awesome, any and all help is appreciated thanzk in advance.
hi i hav a 40hp oil injector mariner engine .1 spark plug has a spark the other 3 have no spark .what can i do fix this problim??.Apologies! It is in fact a 4 HP engine. Thanks for letting me know the year!
If I may ask, what resource did you use to figure out the info?