Mercury 20-50 HP Outboard Carburetor Repair Kit 51991

Mercury Carburetor Repair Kit 51991 is a genuine OEM service kit for select 20-50 HP Mercury carbureted outboards. It is used when servicing or rebuilding compatible carburetors to replace worn fuel-metering and sealing components.

Compatible Applications:

• Select Mercury 20-50 HP outboards
• Carbureted engine applications
• Select Tillotson carburetor assemblies

Mercury parts diagrams show this kit across multiple older carbureted applications, including 20 HP and 4-cylinder 45/50 HP engines. Exact fitment varies by engine, carburetor, and serial number, so the serial number should be verified before ordering.

Specifications:

• Genuine Mercury Marine OEM kit
• Carburetor repair kit
• Select 20-50 HP applications
• Mercury Part Number: 51991
• Also referenced as 1399-51991

Supersedes/Replaces:

• 9270
• 8307
• 6226
• 5199
• 5813
• 6250
• 7812

To Confirm Compatibility: Contact our team with your engine serial number at (727) 596-5929 before ordering.