Sierra 18-99418 Johnson/Evinrude Timer Base, 2 Cylinder, Replaces 763808 175386, Fits 1992-2005 35/40/50 HP

The Sierra 18-99418 is a 2-cylinder timer base built for Johnson and Evinrude outboards that use a 3-wire timer base with S.L.O.W. (Sensor Low Oil Warning). The timer base is a core ignition component that controls spark timing as the throttle advances, and a worn or failing unit is a common cause of rough idle, misfires, hesitation, or a no-start condition on affected 2-cylinder outboards. This timer base is finished in blue and constructed of metal and plastic components for durability in the marine ignition environment.

It is designed as a direct replacement for the OEM timer base on Johnson/Evinrude 2 cylinder engines rated 35, 40, and 50 HP that were built with the 3-wire, S.L.O.W.-equipped timer base configuration, covering model years 1992 through 2005. Confirm your outboard uses the 3-wire S.L.O.W. Timer base setup before ordering, since Johnson/Evinrude used multiple timer base wiring configurations across this HP range and era.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99418
• Category: Evinrude Outboard Ignition System
• Cylinders: 2 Cylinder
• Wiring Configuration: 3-Wire Timer Base with S.L.O.W.
• Color: Blue
• Material: Metal, Plastic
• Weight: 0.7 pounds

Fitment

• Johnson/Evinrude 35, 40, and 50 HP 2 cylinder engines, 1992-2005, using a 3-wire timer base with S.L.O.W.

Replaces (OEM)

• 763808
• 175386

Frequently Asked Questions

What does the Sierra 18-99418 timer base fit? This timer base fits Johnson/Evinrude 2 cylinder outboards rated 35, 40, and 50 HP, model years 1992-2005, that use a 3-wire timer base with S.L.O.W. (Sensor Low Oil Warning).

What OEM part numbers does the 18-99418 replace? The Sierra 18-99418 replaces OEM Johnson/Evinrude part numbers 763808 and 175386.

Is this timer base for a 2-cylinder or 3-cylinder outboard? It is built specifically for 2 cylinder Johnson/Evinrude outboards, not 3-cylinder models.

Does this timer base include the S.L.O.W. Sensor feature? Yes, the 18-99418 is a 3-wire timer base with S.L.O.W. (Sensor Low Oil Warning) built in, matching the OEM wiring configuration on covered engines.

How much does the 18-99418 timer base weigh? The Sierra 18-99418 timer base weighs 0.7 pounds.

What material is the timer base made of? It is constructed of metal and plastic components.

What color is the Sierra 18-99418? This timer base is finished in blue.

What symptoms indicate a failing timer base on a Johnson/Evinrude outboard? Rough idle, misfires, hesitation on acceleration, or a no-start condition can indicate a worn timer base on affected 2-cylinder Johnson/Evinrude engines.

Can I use this timer base on any 35, 40, or 50 HP Johnson/Evinrude outboard? Only on 2 cylinder 35, 40, and 50 HP Johnson/Evinrude engines built with the 3-wire S.L.O.W. Timer base, model years 1992-2005; other wiring configurations used in the same HP range are not compatible.

Is the 18-99418 a direct OEM replacement? Yes, the Sierra 18-99418 is a direct replacement for OEM timer base numbers 763808 and 175386 on covered Johnson/Evinrude engines.

What is included when I order the 18-99418? The order includes one Sierra 18-99418 timer base unit.

How many wires does this timer base use? The 18-99418 uses a 3-wire configuration with S.L.O.W.