Mercury 115 HP ProXS Electric Start Steering Trim Tilt Extra Long Shaft Outboard Motor

The Mercury FourStroke 115 XL ProXS is a 4-stroke outboard marine engine designed for sport fishing boats, speed-focused fiberglass boats, and performance-oriented users who require an extra-long shaft. It features a 115 HP / 86 kW and 2064 cc 4-cylinder engine. The ProXS series is Mercury's line that offers optimized high-performance configurations compared to standard FourStroke engines. It is developed for boat use where speed and responsiveness are prioritized, thanks to its high RPM range and performance-oriented fine-tuning.

FourStroke 115 XL ProXS Series Features and Technology Advantages

ProXS models operate at a higher RPM range compared to their standard FourStroke counterparts. Performance-oriented ECU calibration shifts the power band to higher RPMs, increasing responsiveness and top speed.

• 4-Cylinder Engine (2064 cc): ProXS models operate at a higher RPM range compared to their standard FourStroke counterparts
• Extra Long Shaft (572 mm (22.5")): The propeller operates at the optimum depth with the correct transom height
• ProXS Performance Configuration: Enhanced responsiveness and maximum speed with high RPM range and optimized ECU calibration
• Electric Start: Instant activation with key or button — comfortable and quick starting
• Electric Trim and Tilt (Power Trim & Tilt): Adjust trim angle with a button while cruising — fuel efficiency optimization; fully raise the engine with tilt
• External Floating Fuel System: Large capacity external tank connection — range is determined by user needs

Extra Long Shaft — What Type of Boat Is It Suitable For?

The extra-long shaft (572 mm (22.5")) allows the propeller to operate at the correct water depth on large fiberglass and aluminum boats with high freeboards. It is 64 mm longer than a standard long shaft (508 mm).

Technical Specifications

Who is This Engine For?

• Sport fishing boats: fast planning and quick positioning with a high RPM range
• Performance-oriented fiberglass boats: increased responsiveness and speed with ProXS calibration
• Tournament fishing: quick displacement and efficient fuel use
• Boat owners who desire speed and performance: a superior performance layer compared to standard FourStroke

Maintenance and Longevity

4-stroke Mercury engines operate trouble-free for many years with regular oil changes and end-of-season maintenance protocols. The impeller of the water-cooled system should be checked every 100 hours or every two seasons. In saltwater use, freshwater flushing is mandatory after each use.

Related maintenance categories: Maintenance Kit | Engine Oil | Impeller | Mercury Spare Parts

Frequently Asked Questions

What is the difference between ProXS and standard FourStroke 115 HP?

ProXS models use the same engine block but offer a higher RPM range and performance-oriented ECU calibration. They provide higher maximum RPMs, increased responsiveness, and superior top speed performance compared to the standard model. Fuel consumption may be slightly higher at wide-open throttle positions.

Which propeller works best with the ProXS engine?

Since ProXS models are optimized for a high RPM range, a propeller with a lower pitch is generally preferred. Propeller selection should be determined by a Mercury service technician based on the boat type, weight, and desired speed-acceleration balance.

Are ProXS maintenance requirements different from standard FourStroke?

Basic maintenance requirements are similar: regular oil changes, impeller checks, and end-of-season maintenance. However, due to high-RPM use, it is advisable to pay more attention to oil quality. Service intervals should be followed according to manufacturer recommendations.

Which boat and inflatable boat brands are compatible with the FourStroke 115 XL ProXS?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal transom clamp or transom mounting system. The only criteria are your boat's transom height of 572 mm (22.5") and the maximum engine power approved by the manufacturer. You can get compatibility confirmation from Clever Marin by sharing your boat model.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury ProXS 115–150 HP
• Mercury 175–300 HP FourStroke
• Outboard Motors
• Boat Engines
• Maintenance Kit
• Impeller
• Anode

Is This the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's confirm the suitability of the Mercury FourStroke 115 XL ProXS engine for your boat and the correct shaft selection together.