Mercury – Command Thrust 300 Hour Maintenance Kit | FourStroke Service Pack | Precision Marine Components | 8M0120867

Overview

There’s a certain comfort that comes from knowing your outboard is ready for whatever the day brings—smooth tides, choppy water, long drifts, or a quick run back to the dock before the weather turns. When you own a small but hardworking Mercury FourStroke, routine maintenance isn’t just a box to check; it’s part of the rhythm of boating. You service your engine because you trust it, and you want that trust returned every time you turn the key.

The Mercury 8M0120867 300 Hour Maintenance Kit makes that ritual feel simple and satisfying. Everything you need is right where it should be, built to the same standard as the engine itself. It’s the kind of kit you’ll be glad you had on hand—reliable, complete, and designed to keep your Command Thrust outboard feeling crisp and dependable for seasons to come.

Key Features

• Complete maintenance kit for Mercury 8-9.9hp FourStroke Command Thrust outboards
• High-quality filters with premium internal pleat counts for superior filtration
• Includes fuel filter, oil drain seal, thermostat and gaskets, spark plugs (two), gearcase seals, water pump impeller kit, and anode
• Heavy-duty, corrosion-resistant housings built to withstand harsh marine conditions
• Designed to match all original equipment specifications for guaranteed fit and function

Engine & Boat Compatibility

• Fits Mercury 8hp and 9.9hp FourStroke Command Thrust engines
• Compatible with carbureted and EFI models
• Intended for engines with serial numbers 0R042475 through 1R279944
• Commonly used on jon boats, dinghies, sailboat auxiliary setups, small fishing rigs, and tender craft

Performance & Practical Benefits

A well-maintained small outboard feels different the moment it’s dropped in the water. Idle settles in smooth and steady. Throttle response feels tight and clean. And the shifts—especially on a Command Thrust—snap in with reassuring precision. This kit helps bring all of that back by refreshing the essential wear components Mercury designed the engine around.

The new impeller restores strong, reliable cooling flow. Fresh spark plugs help the engine fire quickly and evenly, even after long storage. Updated filters keep fuel and oil free of contaminants, adding protection you can actually feel when the motor is pushing a loaded boat against wind and tide. And because every part is built to Mercury’s exact standards, installation is straightforward, and the fit is secure and confidence-building.

Whether you fish shallow flats at dawn, run gear for work, or cruise slow along the shoreline, a complete 300-hour service brings back the ease and satisfaction of using an engine that just works.

Why Buy OEM

• Genuine Mercury Marine part built to match factory specs
• Long-lasting materials that stand up to freshwater and saltwater use
• More cost-effective over time than mixing aftermarket components
• Ensures precise fitment with no unexpected surprises
• Helps maintain engine reliability, resale value, and total ownership confidence

When you’re taking care of a small outboard you rely on day after day, OEM parts are simply the practical choice.

FAQ

Q1: Which engines does this kit fit?

It fits Mercury 8hp and 9.9hp FourStroke Command Thrust models within the listed serial number range.

Q2: What makes this kit better than aftermarket options?

Every component is engineered to Mercury’s original standards, ensuring proper fit and long-term durability.

Q3: How do I confirm this is the right kit for my engine?

Match your serial number to the range 0R042475–1R279944, or check your owner’s manual.

Q4: Can this kit be used in both fresh and saltwater?

Yes, all included components are designed for harsh marine environments.

Q5: Is installation easy for most boat owners?

If you’re comfortable performing routine service, you’ll find this kit straightforward and well-organized.