Sierra Timer Base 18-99453 for Johnson Evinrude 6 Cylinder Outboard Ignition

The Sierra 18-99453 timer base is a replacement ignition component built for Johnson and Evinrude 6 cylinder outboard engines. The timer base is a core part of the points-style ignition system, working with the flywheel to control ignition timing as the engine runs. Over time the original timer base can wear at the follower or bearing points, causing rough running, misfires, or hard starting, and replacing it restores accurate, consistent timing to the ignition system.

This timer base is designed as a direct fit for Johnson and Evinrude 6 cylinder outboard powerheads, making it a straightforward swap for anyone servicing the ignition system on a compatible 6 cylinder OMC outboard. It is sold as a standalone timer base component for technicians and boat owners performing ignition system maintenance or troubleshooting timing-related running issues.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99453
• Product Name: Johnson Evinrude Timer Base - 6 Cylinder
• Cylinder Configuration: 6 cylinder
• Category: Evinrude Outboard Ignition System
• Weight: 0.8 pounds

Fitment

• Johnson and Evinrude 6 cylinder outboard engines

Frequently Asked Questions

What does the Sierra 18-99453 timer base do? It is the ignition timer base for Johnson and Evinrude 6 cylinder outboard engines, working with the flywheel to control ignition timing as the engine runs.

Which engines is the 18-99453 timer base designed for? This timer base is designed for Johnson and Evinrude 6 cylinder outboard engines.

How much does the 18-99453 timer base weigh? The Sierra 18-99453 timer base weighs 0.8 pounds.

Is this timer base for a 6 cylinder or 4 cylinder outboard? The 18-99453 is built specifically for 6 cylinder Johnson and Evinrude outboard engines, not 4 cylinder models.

What ignition system category does this part belong to? The Sierra 18-99453 is categorized under the Evinrude outboard ignition system, as it is a core timing component of that system.

Why would I need to replace the timer base on my outboard? A worn timer base can cause inaccurate ignition timing, leading to rough running, misfires, or hard starting, so replacing the 18-99453 timer base restores proper timing control.

Is the Sierra 18-99453 a genuine Sierra part? Yes, 18-99453 is the Sierra manufacturer part number for this timer base.

What brand is this timer base made by? This timer base is manufactured by Sierra under part number 18-99453.

Does the 18-99453 timer base come with mounting hardware or other components? The 18-99453 is sold as the timer base component itself for Johnson and Evinrude 6 cylinder outboard ignition systems.

Can I install the 18-99453 timer base myself? The Sierra 18-99453 timer base is a direct-fit replacement for 6 cylinder Johnson and Evinrude outboards, suited to standard ignition system service and repair.