Yamaha F2 Anode Replacement
Sacrificial anodes are the cheap parts that protect the expensive metal on your 2 hp Yamaha F2 from galvanic corrosion. Below is the anode we recommend, which F2 variants it fits, a step-by-step video, and answers to the zinc-vs-aluminium question.
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Watch: how to do it (step by step)
How to replace the anode on a Yamaha F2
Yamaha Outboard F2.5A, F4B, F5A, F6C 2015 Onwards – How To Check Thermostat & Engine Anode
Tools Needed
- M10 socket
- Phillips head screwdriver
- Air pliers (optional)
- Warm water for testing
Safety
- Ensure the engine is cool before starting.
- Be cautious with the grounded bolt.
Steps
- Remove the cowl by unscrewing the three M10 bolts.
- Take note of the water outlet and any other components for proper reassembly.
- Remove the thermostat housing by unscrewing the bolts, ensuring the grounded bolt is noted.
- Move any cables out of the way to access the anode and thermostat.
- Unscrew the anode using a Phillips head screwdriver.
- Remove the thermostat using air pliers if necessary.
- Clean the thermostat and check for any buildup or corrosion.
- Test the thermostat in warm water to ensure it opens correctly.
- Replace the anode with a new one if available.
- Replace the thermostat and the gasket.
- Reassemble the thermostat housing with the new gasket.
- Reattach the cowl with the three M10 bolts, including the grounded bolt.
Tips
- A fairly new engine should not have significant issues with the thermostat or anode.
- The replacement gasket is made of a cork-like material.
- The job is easy to do yourself with basic tools.
Which part do I need for my Yamaha F2?
For most F2 owners the part above (18-6070) is the right choice. Price tip: the aftermarket numbers are usually noticeably cheaper than the OEM-branded box — it is the same physical part. If you need an exact match, these compatible part numbers also fit:
Show all compatible part numbers (3)
| Part number | Description | Fits | |
|---|---|---|---|
| 18-6122 | Trim Tab Anode Small | F2.5A/ F9.9H/ F13,5B/ F15C/ F20B,M | Find on Amazon → |
| 18-6122A | Sierra 18-6122A | F2.5A/ F9.9H/ F13,5B/ F15C/ F20B,M | Find on Amazon → |
| 18-6122Z | Sierra 18-6122Z | F2.5A/ F9.9H/ F13,5B/ F15C/ F20B,M | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Build years are shown where our parts data has them. Where a variant has no years, only the model code is listed. Confirm against your engine plate before ordering.
Frequently asked questions
What anode fits a Yamaha F2 (2 hp)?
The Yamaha F2 uses the anode sold as Sierra 18-6070, plus its OEM and aftermarket cross-references (3 compatible numbers are listed above). Confirm the number against your engine's model code and year plate before ordering.
How often should I replace the anode on a Yamaha F2?
Inspect your anodes at least once a season and replace them once they are about half eaten away.
Zinc, aluminium or magnesium anodes?
Zinc and aluminium anodes are for saltwater (aluminium also works in brackish water); magnesium is for freshwater only. Pick one type and use it consistently across the engine — mixing types reduces protection.
What happens if the anodes on a Yamaha F2 wear out?
Galvanic corrosion starts attacking the propeller, gearcase and trim hardware instead — repairs that cost far more than a set of anodes. Anodes are consumables; replacing them on time is the whole point.
How long does an anode change take on a Yamaha F2?
Typically well under an hour with basic hand tools — one of the easiest DIY jobs on the engine. The video above shows where each anode sits.
Related guides
- Yamaha F60 anode
- Yamaha F150 anode
- Yamaha F6 anode
- Yamaha F4 anode
- All Yamaha maintenance guides
- Free Yamaha boat valuation
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