Where can I find an owners manual for a Monarch 140 DXL boat?

Boat manual yes

Larson Boat Owners Manuals PDF - Boat & Yacht manuals PDF

https://www.downloadboatmanuals.com > boats > larson

Larson Sport Boat Models Owner's Manual [ENG] PDF. Larson Sport Boat ... Larson Sport Owner's Manual.pdf ... I need a manual for my 1997 290 cabrio. #3.

Engine manual yes

https://www.volvopenta.com/service-and-support/your-engine/manuals-and-handbooks/

cobra outdrive yes $35

Repair Manual, OMC Inboard, Cobra, Cobra SX 86-98 ...

https://bpi.ebasicpower.com > omc-stern-drives-manuals

ebasicpower.com Repair Manual, OMC Inboard, Cobra, Cobra SX 86-98 [SEL3404] - Seloc ® Marine Repair Manual for OMC Inboard and Cobra Stern Drive ...

Videos

https://www.google.com/search?q=SX+Cobra+out+drive&rlz=1C1QJDB_enCA643CA644&oq=SX+Cobra+out+drive&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8

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shttps://www.maritimepropulsion.com/files/pdf/1001382 ee link address for 140 service manual

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go google and type in--- workshop manual for suzuki 140 hp 4 stroke outboard and there are manuals that are available on different site
the manuals will show where the lines are
one site --servicemanualspro.info--- has a pdf down load link

Depending on what you need the manual for, an Owners manual may work.

http://www.iboats.com/Bass-Fish-Outboard-Ski-Boats-Boat-Owner-s-Manual-Ken-Cook-Co/dm/view_id.503847

Sorry this item is not in my area of expertise.

What do you need the owners manual for but you can always google it out.

it must be worth some thing try putting it on ebay? there must be a collector who will pay good money for it,,,get it valued first so you have an idear of the price you wont for it,,,then put a reserve on it,,,so it dont sell off cheap

try at www.ifixmachines.com