Sierra 18-99168 Johnson Evinrude Power Pack, Replaces 581925, 3/6 Cylinder 65-235 HP 1972-1978

The Sierra 18-99168 is a replacement power pack for Johnson and Evinrude 3 cylinder and 6 cylinder outboard engines. The power pack is the core ignition control module that manages spark timing and delivery, and a failing unit is a common cause of hard starting, misfiring, stalling, or a complete no-spark condition on these outboards. Installing a fresh 18-99168 restores factory ignition function without the guesswork of troubleshooting an aging original unit.

This power pack is built to fit 3 cylinder Johnson/Evinrude outboards rated 65, 70, and 75 HP from 1972-1978, as well as 6 cylinder Johnson/Evinrude outboards rated 150, 175, 200, and 235 HP from 1976-1978. It is a direct cross-reference for multiple original Johnson/Evinrude part numbers, so it can be used to replace an existing power pack without modification to the wiring harness or mounting.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99168
• Product Type: Outboard Ignition Power Pack
• Material: Rubber
• Weight: 0.9 pounds
• 3 Cylinder Fitment: 65, 70, 75 HP, 1972-1978
• 6 Cylinder Fitment: 150, 175, 200, 235 HP, 1976-1978
• OEM Cross Reference: 581925, 582057, 581713, 581726, 581334, 581493, 581551, 581552

Fitment

• Johnson/Evinrude 3 cylinder outboards: 65 HP, 70 HP, 75 HP (1972-1978)
• Johnson/Evinrude 6 cylinder outboards: 150 HP, 175 HP, 200 HP, 235 HP (1976-1978)

Replaces (OEM)

• 581925
• 582057
• 581713
• 581726
• 581334
• 581493
• 581551
• 581552

Frequently Asked Questions

What engines does the Sierra 18-99168 power pack fit? The Sierra 18-99168 fits Johnson/Evinrude 3 cylinder outboards rated 65, 70, and 75 HP from 1972-1978, and Johnson/Evinrude 6 cylinder outboards rated 150, 175, 200, and 235 HP from 1976-1978.

Does the 18-99168 replace my original Johnson/Evinrude power pack? Yes, the Sierra 18-99168 cross-references to original Johnson/Evinrude power pack numbers 581925, 582057, 581713, 581726, 581334, 581493, 581551, and 581552, so it is a direct replacement for any of those parts.

How much does the 18-99168 power pack weigh? The Sierra 18-99168 power pack weighs 0.9 pounds.

What is the power pack made of? The Sierra 18-99168 power pack is constructed with rubber as part of its housing material.

Will this power pack work on a 4 or 5 cylinder Johnson/Evinrude outboard? No, the Sierra 18-99168 is designed specifically for 3 cylinder (65, 70, 75 HP) and 6 cylinder (150, 175, 200, 235 HP) Johnson/Evinrude outboards, not 4 or 5 cylinder models.

What does a power pack do on an outboard motor? On these Johnson/Evinrude outboards, the power pack controls spark timing and ignition delivery; a worn or failed unit like the original 581925 or 582057 often causes hard starting, misfiring, or stalling, which the Sierra 18-99168 is built to correct.

Is the Sierra 18-99168 a genuine OEM part or aftermarket? The 18-99168 is a Sierra-branded replacement part engineered to replace the original Johnson/Evinrude power packs (including 581925, 582057, 581713, 581726, 581334, 581493, 581551, and 581552), rather than a part sourced directly from Johnson/Evinrude.

What years of engines is the 18-99168 compatible with? For 3 cylinder 65, 70, and 75 HP engines, the Sierra 18-99168 covers model years 1972-1978. For 6 cylinder 150, 175, 200, and 235 HP engines, it covers 1976-1978.

Can the 18-99168 replace part number 581552? Yes, part number 581552 is one of the eight original Johnson/Evinrude numbers that the Sierra 18-99168 power pack directly replaces.

Does installing the 18-99168 require any wiring modifications? The Sierra 18-99168 is designed as a direct cross-reference for the original Johnson/Evinrude power pack numbers it replaces, so it is intended to install using the existing wiring and mounting on compatible 3 and 6 cylinder outboards.