Yamaha F2.5A & F2.5B 2.5 HP 4-Stroke Outboard Service Kit

Comprehensive SSI Marine service kits for Yamaha F2.5A and F2.5B 2.5 HP 4-stroke outboard engines.

This listing combines both generations into one product, with 6 service-kit options.

F2.5A – 2002–2014

Choose:

100 Hour – With Oils
300 Hour – Without Oils
300 Hour – With Oils & Grease

F2.5B – 2015 & Up

Choose:

100 Hour – With Oils
300 Hour – Without Oils
300 Hour – With Oils & Grease

IMPORTANT

F2.5A and F2.5B use different service components.

Please select your engine model AND service level carefully before ordering.

Yamaha F2.5A – 2003–2013

🔧 F2.5A – 100 HOUR SERVICE KIT WITH OILS

A comprehensive routine service kit for the Yamaha F2.5A 2.5 HP 4-stroke.

Kit Includes:

1 × NGK BR6HS Spark Plug
1 × Impeller
1 × Impeller O-Ring
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
- Replaces Yamaha 90430-08020
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket
1 × 500ml Rock Oil MP+ 4-Stroke Engine Oil
1 × 250ml Yamalube Gear Oil

NOT Included:

❌ Thermostat
❌ Internal Anode
❌ Gearbox Anode
❌ Marine Grease

🔧🔧 F2.5A – 300 HOUR SERVICE KIT WITHOUT OILS

Contains the regular service components plus the additional thermostat and anodes.

Kit Includes:

1 × NGK BR6HS Spark Plug
1 × Impeller
1 × Impeller O-Ring
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket

PLUS:

1 × Thermostat
1 × Internal Anode
1 × Gearbox / Lower Unit Anode

⚠️ NO OILS OR GREASE

This variant does NOT include:

❌ Engine Oil
❌ Gear Oil
❌ Marine Grease

🔧🔧 F2.5A – 300 HOUR SERVICE KIT WITH OILS & GREASE

Most Comprehensive F2.5A Option

Kit Includes:

1 × NGK BR6HS Spark Plug
1 × Impeller
1 × Impeller O-Ring
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket
1 × Thermostat
1 × Internal Anode
1 × Gearbox / Lower Unit Anode

PLUS OILS & GREASE:

1 × 500ml Rock Oil MP+ 4-Stroke Engine Oil
1 × 250ml Yamalube Gear Oil
1 × Recmar Blue Marine Grease – 100g

This is the only F2.5A variant containing marine grease.

Yamaha F2.5B – 2014 & Up

🔧 F2.5B – 100 HOUR SERVICE KIT WITH OILS

The F2.5B kit uses a different spark plug and water-pump arrangement from the F2.5A, so please make sure you select the correct engine.

Kit Includes:

1 × NGK CR6HSB Spark Plug
1 × Impeller
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket
1 × 500ml Rock Oil MP+ 4-Stroke Engine Oil
1 × 250ml Yamalube Gear Oil

NOT Included:

❌ Impeller O-Ring
❌ Thermostat
❌ Internal Anode
❌ Gearbox Anode
❌ Marine Grease

NGK CR6HSB is listed as a service spark plug for the F2.5B.

🔧🔧 F2.5B – 300 HOUR SERVICE KIT WITHOUT OILS

Kit Includes:

1 × NGK CR6HSB Spark Plug
1 × Impeller
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket

PLUS:

1 × Thermostat
1 × Internal Anode
1 × Gearbox / Lower Unit Anode

⚠️ NO OILS OR GREASE

This variant does NOT include:

❌ Engine Oil
❌ Gear Oil
❌ Marine Grease

The F2.5B service-parts catalogue lists thermostat, internal anode and lower anode among its service components.

🔧🔧 F2.5B – 300 HOUR SERVICE KIT WITH OILS & GREASE

Most Comprehensive F2.5B Option

Kit Includes:

1 × NGK CR6HSB Spark Plug
1 × Impeller
1 × Impeller Key
1 × Fuel Filter
2 × Red Gearbox Drain / Fill Plug Washers
1 × Engine Oil Sump Washer
1 × Cotter / Split Pin
1 × Thermostat Gasket
1 × Thermostat
1 × Internal Anode
1 × Gearbox / Lower Unit Anode

PLUS OILS & GREASE:

1 × 500ml Rock Oil MP+ 4-Stroke Engine Oil
1 × 250ml Yamalube Gear Oil
1 × Recmar Blue Marine Grease – 100g

This is the only F2.5B variant containing marine grease.

Quick Comparison – All 6 Variants

Kit Contents	F2.5A 100hr Oils	F2.5A 300hr No Oils	F2.5A 300hr Oils	F2.5B 100hr Oils	F2.5B 300hr No Oils	F2.5B 300hr Oils
Spark Plug	BR6HS	BR6HS	BR6HS	CR6HSB	CR6HSB	CR6HSB
Impeller	✓	✓	✓	✓	✓	✓
Impeller O-Ring	✓	✓	✓	—	—	—
Impeller Key	✓	✓	✓	✓	✓	✓
Fuel Filter	✓	✓	✓	✓	✓	✓
2 × Gearbox Washers	✓	✓	✓	✓	✓	✓
Sump Washer	✓	✓	✓	✓	✓	✓
Cotter Pin	✓	✓	✓	✓	✓	✓
Thermostat Gasket	✓	✓	✓	✓	✓	✓
Thermostat	—	✓	✓	—	✓	✓
Internal Anode	—	✓	✓	—	✓	✓
Gearbox Anode	—	✓	✓	—	✓	✓
500ml Engine Oil	✓	❌	✓	✓	❌	✓
250ml Gear Oil	✓	❌	✓	✓	❌	✓
100g Marine Grease	❌	❌	✓	❌	❌	✓

Important Difference – F2.5A vs F2.5B

F2.5A

Uses:

NGK BR6HS Spark Plug
Impeller O-Ring

F2.5B

Uses:

NGK CR6HSB Spark Plug
No impeller O-ring is supplied in these SSI Marine F2.5B service kits

Please select the correct engine generation.

The two kits may look very similar in the photographs, but they are not identical.

300 Hour Additional Service Parts

Both the F2.5A and F2.5B 300 Hour variants contain:

Thermostat

Internal Anode

Gearbox / Lower Unit Anode

The lower anode 6L5-45251-03 is used across several small Yamaha outboards, including F2.5 applications.

These parts are not supplied in the 100 Hour variants.

Oils & Lubricants

Kits WITH Oils Include:

Rock Oil MP+ 4-Stroke Engine Oil

Quantity: 500ml

Yamalube Gear Oil

Quantity: 250ml

Both 100 Hour With Oils and 300 Hour With Oils contain the engine and gear oils.

Marine Grease

Recmar Blue Marine Grease – 100g

⚠️ Grease is ONLY included in the 300 Hour With Oils variants.

It is NOT supplied with:

F2.5A 100hr With Oils
F2.5A 300hr Without Oils
F2.5B 100hr With Oils
F2.5B 300hr Without Oils

SSI Marine Service Kits

These kits are assembled by SSI Marine, based around the appropriate REC2.5A / REC2.5B service components, with the contents adjusted by us to create practical 100-hour and 300-hour servicing options.

We include additional service items such as the gearbox drain washers, sump washer and cotter pin so that commonly required small components are supplied together.

Depending on the component, our kits may contain a combination of quality marine aftermarket, OEM-spec and branded service products.

OEM part numbers are used for identification and compatibility reference.

Please check the product pictures carefully.

The pictures for each variant show the components supplied with that particular service-kit option.

Important – Check Your Engine Before Ordering

Please confirm:

Yamaha Outboard
2.5 HP
4 Stroke
Whether your engine is F2.5A or F2.5B
Exact model and serial number
Required 100hr or 300hr kit
Whether you require oils

Do not order solely by horsepower or appearance.

If a part looks the same as the one fitted to your engine, this does not always mean it is the correct part.

If you are unsure whether you have an F2.5A or F2.5B, please contact SSI Marine with your complete engine model and serial number before ordering.

Why Buy From SSI Marine?

Workshop-developed service kits
Quality aftermarket & OEM-spec components
Same-day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
UK stock
Collection from Leigh, Greater Manchester
Technical support from experienced outboard specialists
More than 10 years supplying outboard parts
Workshop open Monday–Friday, 9 AM–5 PM

2.5 HP Yamaha Outboard F2.5A F2.5B 4 Stroke Service Kit 100hr 300hr With / Without Oils