Mercury 40 HP LW TwoStroke – The secret to our mid-range is our renowned reliability thanks to its cool running. With high volume, low pressure, floppy-vane water impellers keeping operating conditions down.
Calculate your fuel savings
The Mercury Fuel Savings Calculator will allow you to easily calculate the possible fuel savings of a Mercury FourStroke outboard!
Choose how you use your boat, select the TwoStroke and FourStroke horsepower – and our tool will show your potential fuel savings. If you’re looking to upgrade or add more power, you can even choose different FourStroke and TwoStroke horsepower options!
With the largest engine capacity displacement in their horsepower category, the TwoStrokes give you more low-end thrust.
|Model||40 HP LW (TwoStroke)|
|Engine Type||40 HP LW TwoStroke|
|Displacement (CID/CC)||42.5 / 697|
|Full throttle RPM||5000-5700|
|Fuel induction system||Loop-charged (3 carb)|
|Shaft length||20″ / 508 mm|
|Gearcase ratio||1.85 : 1|
|Dry weight *Lightest model available||72|
|Emissions Star Rating||1|
|Bore and stroke||68 x 64|
|Trim system||4 position