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

The Mercury FourStroke 115 L CT ProXS is a 4-stroke outboard marine engine designed for sports fishing boats requiring a long shaft, speed-oriented fiberglass boats, and performance-driven users, featuring a 115 HP / 86 kW and 2064 cc 4-cylinder engine. Thanks to its Command Thrust (CT) gearcase system, it boasts the large gearcase and propeller of a higher horsepower engine. The ProXS series is Mercury's range that offers optimized high-performance configurations compared to standard FourStroke engines. It is developed for boat usage where speed and responsiveness are prioritized, featuring a high RPM range and performance-oriented fine-tuning.

FourStroke 115 L CT 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.
• Long Shaft (508 mm (20")): The propeller operates at optimal depth with the correct transom height.
• ProXS Performance Configuration: Enhanced responsiveness and maximum speed with a high RPM range and optimized ECU calibration.
• Command Thrust (CT) Gearcase: The large gearcase and propeller of a higher horsepower engine — high torque at low RPMs and strong thrust capability.
• Electric Start: Instant engagement with a key or button — comfortable and quick starting.
• Power Trim & Tilt: Adjust trim angle with a button while cruising — optimizes fuel efficiency; fully raise the engine with tilt.
• Floating External Fuel System: Large capacity external tank connection — range is determined by user needs.

Long Shaft — Suitable for Which Boat Type?

A long shaft (508 mm (20")) is suitable for the vast majority of inflatable boats, aluminum boats, and fiberglass boat models. For boats with a transom height of 381 mm, a short shaft model should be preferred.

Technical Specifications

Who is This Engine For?

• Sports fishing boat: fast planning and quick positioning with a high RPM range.
• Performance-oriented fiberglass boat: increased responsiveness and speed with ProXS calibration.
• Tournament fishing: fast repositioning and efficient fuel usage.
• Boat owners seeking speed and performance: a superior performance tier 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.

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

Frequently Asked Questions

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

ProXS models offer the same engine block with a higher RPM range and performance-oriented ECU calibration. Compared to the standard model, it provides higher maximum RPM, increased responsiveness, and superior speed performance. Fuel consumption might be slightly higher at full 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 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 usage, more attention to oil quality is recommended. Service intervals should be followed according to manufacturer recommendations.

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

Mercury outboard engines 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 508 mm (20") and the maximum engine power approved by the manufacturer. You can confirm compatibility with 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 L CT ProXS engine for your boat and the correct shaft selection together.