8783A14 Mercury Carby Assy | Genuine Used Part

🔧 Product Description

Genuine Mercury 7.5HP Walbro WMB Carburettor Assembly - Part Number: 8783A14

A genuine used Mercury Marine complete carburettor assembly for selected 7.5HP twin-cylinder two-stroke outboard motors.

This Walbro WMB-series carburettor incorporates the throttle, choke, float chamber, inlet needle, fuel strainer and diaphragm fuel-pump components required to meter and deliver fuel to the engine.

Part number 8783A14 is specifically calibrated for the 7.5HP engine. The visually similar Mercury 9.8HP carburettor uses part number 8782A13 and different internal calibration.

⚙️ Key Features

• Genuine used Mercury Marine carburettor assembly
• Correct OEM part number 8783A14
• Walbro WMB-series carburettor
• Integrated diaphragm fuel pump and fuel strainer
• Specifically calibrated for Mercury 7.5HP twin-cylinder engines

🚤 Compatibility

Commonly used on

• Mercury 7.5HP twin-cylinder carburetted outboards
• Manual-start and electric-start models
• Short-shaft and long-shaft configurations
• Walbro WMB-2 and WMB-4 carburettor applications

Typically suits

• Engine models:
• Mercury 7.5HP manual-start short-shaft
• Mercury 7.5HP manual-start long-shaft
• Mercury 7.5HP electric-start short-shaft
• Mercury 7.5HP electric-start long-shaft
• Mercury model designations M, ML, E and EL
• USA serial number 5206550 and later
• Canadian serial number 7125388 and later
• Selected European-production 7.5HP models using the WMB carburettor
• 1978 Mercury 7.5HP models from the later serial range
• 1979 Mercury 7.5HP
• 1980-1981 Mercury 7.5HP
• 1982 Mercury 7.5HP
• 1983 Mercury 7.5HP
• 1984 Mercury 7.5HP
• 1985 Mercury 7.5HP
• Selected 1986 Mercury 7.5HP applications
• HP Range: 7.5HP
• Engine Type: Mercury inline two-cylinder carburetted two-stroke outboard
• Carburettor Type: Walbro WMB-2 / WMB-4
• Year Range: Approximately late 1978-1986

🔌 Function

The carburettor draws fuel through its integrated strainer and diaphragm pump, regulates the fuel level through the float and inlet needle, and meters the correct fuel-and-air mixture through the idle and main circuits.

The throttle plate regulates engine speed, while the choke restricts incoming air to enrich the mixture during cold starting.

⚠️ Common Signs of Failure

• Engine is difficult to start when cold
• Engine starts only with excessive choke
• Motor stalls when the throttle is opened
• Fuel leaks or overflows from the carburettor
• Diaphragm fuel pump does not maintain fuel flow
• Engine idles unevenly or sneezes through the carburettor
• Main jet or idle passage is blocked
• Float or inlet needle sticks
• Engine will not reach full operating RPM
• Fuel strainer is restricted by dirt or degraded fuel deposits

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 8783A14 → Supersedes 8783A4
• 8783A4 → Supersedes 6649
• 6649 earlier complete 7.5HP carburettor reference

OEM / Related Numbers

• 8783A14
• 1364-8783A14
• 13648783A14
• 8783A4
• 1364-8783A4
• 6649
• 1364-6649
• Walbro WMB-2
• Walbro WMB-4
• 1395-9026 carburettor and fuel-pump repair kit
• 1395-9027 diaphragm and gasket kit
• 27-89014A80 carburettor gasket set
• 1395-9293 float assembly
• 1395-9022 inlet needle and spring
• 1399-7570 .040 main fuel jet
• 1399-5758 fuel-strainer screen
• 1399-5207 strainer-cover gasket
• 27-63309 carburettor flange gasket

Aftermarket / Verified Equivalents

• BH Marine: BHF236 - complete replacement carburettor
• Aftermarket Walbro WMB Repair Kit: 1395-9026 / 9026
• Sierra: 18-7295 - inlet needle valve
• Sierra: 18-7209 - carburettor float
• Sierra: 18-2572-9 - carburettor flange gasket two-pack
• GLM: 40970 - replacement inlet needle valve
• Mallory: 9-36950 - replacement carburettor float

📦 Condition

• Genuine used part
• Complete carburettor assembly
• Removed from running engine where applicable
• In good working condition unless otherwise stated