Mercury – Quicksilver Carburetor Diaphragm Kit | Fuel System Component | Vintage 2-Stroke | 5137

Overview

If your classic Mercury or Mariner 2-stroke is starting to stumble or lose power, it could be time to freshen up the carb. The Mercury Marine 5137 Quicksilver Carburetor Diaphragm Kit is built for vintage 7.5–50HP Mercury and Mariner outboards, restoring the flexible internal parts that control fuel delivery. Over time, old diaphragms harden or crack, causing lean conditions or rough idle. This OEM kit includes five precision diaphragms, designed to fit perfectly and bring your outboard’s carburetor back to smooth, reliable operation.

Key Features

• Purpose: Restores fuel delivery consistency in older 2-stroke carburetors.
• Contents: Includes five replacement diaphragms made to original Mercury specifications.
• Material: Built from fuel-resistant, marine-grade rubber that stays flexible season after season.
• Performance: Helps eliminate hard starts, surging, and hesitation caused by worn diaphragms.
• Design: Precisely molded to fit vintage 7.5–50HP Mercury and Mariner 2-stroke outboards.
• Ease of Use: Installs easily with standard tools — refer to your service manual for proper procedure.

Engine & Boat Compatibility

• Vintage Mercury 7.5HP 2-stroke outboards
• Vintage Mercury 9.8HP 2-stroke outboards
• Mercury 20HP, 25HP, and 35HP inline 2-stroke outboards
• Mercury and Mariner 40–50HP classic 2-stroke outboards

Performance & Real-World Benefits

The 5137 diaphragm kit breathes new life into classic Mercury and Mariner engines. By restoring the flexible diaphragms inside the carburetor, it helps maintain steady fuel flow, preventing bogging and stalling when you accelerate. The result is cleaner idle, stronger throttle response, and easier cold starts.

Vintage engines depend on proper fuel metering, and fresh diaphragms make all the difference. Whether you’re restoring a classic outboard or keeping a trusted old motor alive, this kit brings it back to the reliable, steady performance Mercury engines are known for.

Why Choose Mercury OEM

The Quicksilver 5137 is a genuine Mercury Marine part, designed specifically for the carburetor systems used in older 2-stroke engines. Aftermarket kits often include mismatched diaphragms made from cheaper materials that can swell, tear, or stiffen over time.

Mercury’s OEM diaphragms are fuel-resistant, precision-cut, and tested for the right flexibility to deliver consistent performance. Using factory parts ensures your carb rebuild lasts longer and your engine runs exactly the way it should.

FAQ

Q1: What engines does this kit fit?
It’s made for vintage Mercury and Mariner 7.5–50HP 2-stroke outboards.

Q2: What’s included in the kit?
You’ll receive five replacement diaphragms for a complete carburetor rebuild.

Q3: What are the signs of a bad diaphragm?
Hard starts, uneven idle, stalling, or poor throttle response are all common symptoms.

Q4: Is this kit fuel-safe?
Yes — the diaphragms are made from marine-rated rubber designed to handle modern fuels.

Q5: Why OEM instead of aftermarket?
Mercury OEM diaphragms fit perfectly, last longer, and resist ethanol-related wear better than off-brand parts.