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https://www.mercurymarine.com/en/ca/engines/outboard/fourstroke/75-150-hp/Mercury FourStroke outboard motors are incredibly powerful and efficient, and they feature a wide range of applications. Crafted for less weight and high displacement, they generate abundant torque and immediate power. ... 150 115 90 75.
HP / kW: 150 / 110 Engine type: 8-valve single overhead cam ... Dry weight *Lightest model available: 455 lbs / .
Have your spark plugs changed AND carbs cleaned and adjusted.
Usually that can also be caused by a seized advance system ( plate under the flywheel, commanded to turn with the throttle linkage... )
I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.
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