Recmar Yamaha 9.9-55HP 2-Stroke Thermostat 143F 6F5-12411-03
REC6F5-12411-03
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Recmar Yamaha 6F5-12411-03 Thermostat
62°C / 143°F replacement for selected classic Yamaha two-stroke outboards
RECMAR aftermarket thermostat replacing Yamaha 6F5-12411-03 and its earlier superseded references. Verified applications are selected two-stroke model families from 9.9 to 55 HP, mainly from the late 1980s through the 1990s; this is not a blanket fit for all 9.9–55 HP Yamaha engines.
Key Features
- Aftermarket RECMAR replacement; not genuine Yamaha
- 62°C / 143°F nominal calibration
- Supersedes Yamaha 6F5-12411-01 and -02 where officially listed
- For selected Yamaha 9.9D, 15D, 20C, 25D, 40Q and 55B families
- Direct cooling-system service part
- One thermostat supplied; verify gasket/seal requirements
Technical Specs
| Part type | Outboard thermostat |
| Opening temperature | 62°C / 143°F nominal |
| Engine type | Selected Yamaha two-stroke outboards |
| Power range | 9.9–55 HP, model dependent |
| 4Boats SKU | REC6F5-12411-03 |
Confirmed Compatibility
| Exact engine application | Years / model range |
|---|---|
| Yamaha 9.9 / 15 HP 2-stroke | 1986–1995 |
| Yamaha C25 | 1991–1997 |
| Yamaha CV25 | 1990 |
| Yamaha 30 / C30 / CV30 | 30: 1986; C30: 1991–1992; CV30: 1989–1990 |
| Yamaha C40 | 1991–1997 |
| Yamaha C55 / CV55 | C55: 1994–1995; CV55: 1989–1990 |
Part Number Cross Reference
| Yamaha OEM | 6F5-12411-03; 6F5-12411-03-00 |
| Supersedes | 6F5-12411-01-00; 6F5-12411-02-00 |
| Sierra | 18-3625 |
| RECMAR / 4Boats | REC6F5-12411-03 |
Frequently Asked Questions
Is it suitable for four-stroke Yamaha engines?
The verified core fitment is selected two-stroke models; check the OEM catalogue before any other use.
Will it fit every 40 HP Yamaha?
No. Only model/year combinations that specify the 6F5 reference.
What temperature is it?
62°C / 143°F nominal.
Is a gasket included?
Check the product images and supplied items; order the correct model-specific gasket if it is not shown.
Installation note: Work only on a cool engine. Clean the housing and seating face, renew disturbed seals where required, follow the manufacturer's torque procedure, then run the engine and check for leaks and correct cooling-water flow.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
