IAC / Idle Air Control Solenoid Valve for Suzuki Outboards

Marine-grade aftermarket IAC (Idle Air Control) / intake air solenoid valve for selected Suzuki DF40 and DF50 4-stroke outboards.

The IAC valve controls bypass airflow through the intake system to help the engine maintain the correct idle speed.

Replaces Suzuki 18117-84380 / 18117-84380-000.

Fitment

Fits selected Suzuki 4-stroke outboards:

DF40 – 40 HP – original generation
DF50 – 50 HP – original generation
Approximately 1999–2010, depending on model / market

Important

This listing is for the original DF40 / DF50 engine family.

It is NOT automatically suitable for the later DF40A / DF50A engine family.

Always confirm using the original part number and engine serial number.

Replaces Suzuki Part Numbers

18117-84380
18117-84380-000
1811784380
1811784380000

Additional Cross Reference

Mercury 877805T

Mercury 877805T is cross-referenced to this IAC valve on selected applications.

Product Function

The IAC / Idle Air Control valve regulates bypass airflow through the intake system while the throttle is closed or near the idle position.

A faulty or sticking IAC valve may contribute to:

Rough or unstable idle
Engine stalling at idle
Incorrect or high idle speed
Difficult starting
Poor low-speed running

These symptoms can also be caused by other fuel, air, sensor, wiring or ignition faults, so correct diagnosis is recommended before replacing the valve.

Product Features

IAC / Idle Air Control Valve
Intake air solenoid valve
Fits selected Suzuki DF40 / DF50
40 HP / 50 HP
4 Stroke
Direct replacement where part number matches
Marine-grade aftermarket part
New

What's Included

1 × IAC / Intake Air Control Solenoid Valve

⚠️ Important Compatibility Warning

This valve does NOT fit every Suzuki 40 HP or 50 HP outboard.

Before ordering, please check:

Engine model – DF40 / DF50
Model year
Complete serial number
Original IAC valve part number
Electrical connector

If the part looks the same as yours, this does not always mean it is the correct part for your outboard.

If unsure, send SSI Marine your engine model + horsepower + complete serial number and we will help check compatibility.

Buyer Responsibility

It is the buyer's responsibility to confirm compatibility before purchasing.

OEM part numbers are used for identification and reference purposes only.

Correct diagnosis is recommended before replacing an IAC valve, as similar symptoms can be caused by the throttle body, fuel system, sensors, wiring, air leaks or ignition faults.

Why Buy From SSI Marine?

Marine-grade aftermarket & OEM-spec parts
Workshop-tested products
Same-day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
UK stock
Collection from Leigh, Greater Manchester
Technical support from experienced outboard specialists

40 HP 50 HP Suzuki Outboard DF40 DF50 4 Stroke IAC Idle Air Control Valve 18117-84380