100 Hour Maintenance Kit – Fits Mercury 75-115 HP 4-Stroke 2.1L Outboard (Replaces 8M0097854)
100 Hour Maintenance Kit – Fits Mercury 75-115 HP 4-Stroke 2.1L Outboard (Replaces 8M0097854) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
100 Hour Maintenance Kit – Fits Mercury 75-115 HP 4-Stroke 2.1L Out...
Product Details
This 100 Hour Maintenance Kit – Fits Mercury 75-115 HP 4-Stroke 2.1L Outboard (Replaces 8M0097854) provides all the essential components for the scheduled 100-hour service interval. It is designed specifically for Mercury 75, 80, 90, 100, and 115 HP 4-Stroke 2.1L EFI outboard models manufactured from 2001 to 2023.
This kit serves as a direct replacement for Mercury OEM part number 8M0097854, containing all the necessary filters, spark plugs, and seals for a complete service.
- Includes all essential filters and spark plugs for a standard 100-hour service.
- All components are direct-fit replacements for simple, engine-specific installation.
- Kits are available in multiple variants to match your engine’s specified oil type.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 8M0097854 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 75 HP EFI | 75 | 4-Stroke | 2001–2023 | 8M0097854 | 2.1L engines |
| Mercury | 80 HP EFI | 80 | 4-Stroke | 2001–2023 | 8M0097854 | 2.1L engines (International model) |
| Mercury | 90 HP EFI | 90 | 4-Stroke | 2001–2023 | 8M0097854 | 2.1L engines |
| Mercury | 100 HP EFI | 100 | 4-Stroke | 2001–2023 | 8M0097854 | 2.1L engines (International model) |
| Mercury | 115 HP EFI | 115 | 4-Stroke | 2001–2023 | 8M0097854 | 2.1L engines |
Technical Specs
- Product Type
- Maintenance Service Kit
- Installation
- Engine-specific installation
- Fuel Type
- Gasoline
- Connection
- Direct replacement components
- Housing Material
- Multiple components
- Housing Color
- Multiple colors
- Dimensions
- 14.5" L x 18.5" W x 16.3" H
- Fitting Type
- Multiple (OEM fit)
- Thread Size
- Various per component
- Other Technical Attributes
- For 100 hour maintenance interval
What’s in the Box
- 1 x Oil Filter
- 1 x Fuel Filter Element
- 4 x Spark Plugs (NGK ZFR5F)
- 1 x Fuel Hose Fitting/Filter
- 1 x Water Pump Indicator Seal
- 1 x Lubricant (specification varies by kit variant)
Note: This kit is available in multiple oil variants: Standard with 10W-30 oil, Standard with 10W-30 Synthetic Blend, Standard with 25W-40 oil, and Standard with 25W-40 Synthetic Blend.
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery. Place a drain pan under the engine.
- Remove the drain plug to drain the old engine oil, then remove and replace the oil filter. Apply a light coat of new oil to the new filter's gasket before installing.
- Reinstall the drain plug and refill the engine with the correct grade of lubricant as specified in your owner's manual.
- Locate and replace the fuel filter element and the separate fuel hose fitting/filter.
- Remove the old spark plugs and install the new ones, ensuring they are gapped to the manufacturer's specifications.
- Inspect and replace the water pump indicator seal.
- Once all components are installed, reconnect the battery. Run the engine for a few minutes and carefully check for any oil or fuel leaks.
Troubleshooting & FAQ
How do I know if this kit is correct for my engine?
This kit is specifically for Mercury 75-115 HP 4-stroke 2.1L EFI outboards made between 2001 and 2023. Please verify your engine model and year against the compatibility table provided on this page.
What is the difference between the kit variants with different oils?
The variants include different grades of engine oil (10W-30 and 25W-40, in conventional or synthetic blend) to match manufacturer recommendations for different climates and operating conditions. Always consult your owner's manual to select the correct oil for your engine.
How often should I use this service kit?
You should perform this maintenance every 100 hours of engine operation or annually, whichever occurs first. Regular service is crucial for engine longevity and performance.
Does this kit include a water pump impeller or gear lube?
No, this kit contains the essential items for an oil and filter change, fuel filter change, and spark plug replacement. It includes a water pump indicator seal but not the full impeller kit or gearcase lubricant, which should be inspected and purchased separately if needed.
touches>What are signs my outboard needs service?
Common indicators include increased difficulty starting, a noticeable drop in power or acceleration, higher fuel consumption, or simply reaching the 100-hour/1-year service interval.
Are special tools required for this kit?
You will need standard marine mechanic's tools, such as an oil filter wrench, a spark plug socket and gapper, and a basic socket/wrench set. No proprietary tools are required.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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