Mercury 20MRC 20HP Outboard – 15in Shaft, Remote Mechanical, Manual Start
Straight talk: Mercury 20MRC keeps pace at 20 horsepower. The 15-inch shaft works with remote mechanical steering. EFI rounds out the build. The layout favors easy servicing over a season of use.
- 20 horsepower, ready to run
- 15-inch shaft, standard fit
- Remote mechanical steering included
- Manual start, no battery needed
- EFI fuel delivery system
Description
Equip the ultra-lightweight, battery-free Mercury 20MRC to shed dead electrical weight on minimalist helm setups. Weighing exactly 99 pounds, this 333cc inline-two block forces aggressive low-end torque, pushing aluminum flats skiffs through morning shallows. Confirming your exact transom height guarantees this 15 inch shaft mercury outboard motor mounts safely without excessive lower drag.
Frustrated by dead batteries killing your console boat? This rare manual start remote-steer hybrid eliminates starter battery dependency completely. Mercury engineers the 2.15:1 ratio gearcase with hardened steel internal gears. This rigid drivetrain handles violent propeller strikes against submerged river stones during years of remote hunting trips. Proper mechanical routing is essential when repowering skiffs with remote power.
Key Features of Mercury 20MRC
- Battery-Free EFI: Atomizes gas instantly at 5700 RPM, eliminating carburetor jet clogging and ensuring reliable manual pull starts.
- 15-Inch Standard Shaft: Matches low transom profiles perfectly, preventing lower unit drag and maximizing top speed on light skiffs.
- Manual Tilt Bracket: Holds the gearcase out of the water physically, preventing damaging marine algae growth while docked.
- Remote Mechanical Control: Connects your helm wheel directly to the engine pivot tube, sharpening handling response in narrow creeks.
- 12-Amp Alternator: Outputs constant electrical current underway, powering essential navigation lights and bilge pumps without a dedicated starting battery.
- Ultra-Light 45kg Weight: Reduces rear hull draft significantly, allowing minimalist boats to navigate extremely shallow water safely.
- Through-Prop Exhaust: Forces combustion gases directly underwater, significantly reducing engine noise and raw fumes at the operator console.
- Upfront Oil Drain: Simplifies routine lubrication changes, saving significant time during seasonal maintenance prep without special tools.
- 2.15:1 Gear Ratio: Multiplies engine torque effectively, pushing heavily loaded hunting boats onto plane much faster.
- Four-Stroke Combustion: Burns fuel highly efficiently without oil mixing, easily meeting strict local waterway emissions regulations and EPA standards.
Why Choose Mercury 20MRC
Choosing this specific engine limits installation entirely to standard 15-inch transoms rigged with forward steering wheels and throttle boxes. You cannot bolt this onto a tiller-steered skiff. Correcting helm geometry is a key step in finding a lightweight mercury remote control outboard for classic hulls.
- Measure the vertical distance from your top transom edge to the keel bottom.
- Install corresponding mechanical control cables sized exactly for your specific boat length.
- Avoid oil slicks on the water utilizing modern four-stroke internal lubrication.
Ideal Application and Vessel Fitment
This ultra-lightweight block thrives on minimalist aluminum flats skiffs and classic fiberglass river-hunting boats where payload capacity is fiercely protected. By eliminating the heavy 12-volt starting battery, operators can navigate extremely shallow tidal creeks without dragging the hull. Securing this lightweight mercury remote control outboard transforms a bare-bones 15-inch transom hull into a highly maneuverable, off-grid exploration vessel capable of reaching backwater hunting grounds that heavier setups simply cannot access.
Warranty, Support and Maintenance
Authorized recreational operation receives a 3-Year Limited Warranty alongside a 3-Year Corrosion Warranty. Registered commercial applications fall under a strict 1-Year Limited Warranty with zero corrosion coverage applied to the block. Scheduled maintenance requires replacing gearcase lubricants and changing oil filters at manual-specified intervals. Always save all physical service records. Your engine serial number acts as the only way to source exact genuine replacement parts. Mulmotor provides product-information support before purchase and assistance with order-related questions.
Mercury 20HP 20MRC EFI Specs
| Brand | Mercury Marine |
| Full Model Code | 20MRC EFI |
| Country of Origin | USA / Japan Componentry |
| Engine Family/Series | FourStroke Portable |
| Engine Type | Inline 2 / SOHC / 4-Stroke |
| Displacement | 0.33 Liters (333 cc) |
| Horsepower | 20 HP @ 5800 RPM |
| Full Throttle RPM Range | 5700 - 6200 RPM |
| Fuel Induction System | Electronic Fuel Injection (EFI) |
| Alternator Output | 12 Amps |
| Gear Ratio | 2.15:1 |
| Shaft Length | 15" (Short) |
| Dry Weight | 45 kg (99 lbs) |
| Starting & Steering System | Manual Start w/ Remote Mechanical Control |
| Trim/Tilt Method | Manual Tilt |
| Standard Warranty | 3-Year Limited Pleasure |
| Application | Rare remote-steer manual start model; ultra-lightweight for minimalist remote setups. |














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