Recmar Johnson Evinrude Thermostat 143F 394411 18-1506
REC394411
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Recmar Johnson / Evinrude 394411 Vernatherm
62°C / 143°F replacement for selected classic two-stroke outboards
Aftermarket RECMAR Vernatherm replacing OMC/Johnson/Evinrude 394411. Verified applications include 9.9/15 HP Big Bore engines from 1993–1995 and selected 60–300 HP two-strokes from approximately 1985–1990.
Key Features
- RECMAR aftermarket replacement; not genuine OMC/BRP
- 62°C / 143°F nominal Vernatherm
- For selected Johnson/Evinrude 9.9–15 HP Big Bore and 60–300 HP engines
- Direct reference replacement for 394411 / 778199
- Not interchangeable with every similar-looking OMC thermostat
- One Vernatherm supplied
Technical Specs
| Part type | Vernatherm / outboard thermostat |
| Opening temperature | 62°C / 143°F nominal |
| Engine type | Selected Johnson/Evinrude two-stroke |
| Supply | 1 thermostat |
| 4Boats SKU | REC394411 |
Compatibility / Fitment Guide
| Engine family | Verified application | Important notes |
|---|---|---|
| Johnson / Evinrude 9.9 and 15 HP Big Bore | 1993–1995 applications using 394411 | Distinguish Big Bore from other 9.9/15 families |
| Johnson / Evinrude 60–300 HP | Selected 1985–1990 three-cylinder, V4, V6 or V8 applications using 394411 | Exact model number and diagram required |
| Later engines | Do not assume fitment after 1990 for the larger-engine group | Many later models use 434137, 436195, 437090 or other references |
| Four-stroke / E-TEC families | Not included unless expressly cross-referenced by the manufacturer | Cooling systems differ |
Before ordering: Use the model number and year. For small engines confirm Big Bore 1993–1995; for larger engines confirm 394411/778199 in the exact diagram.
Part Number Cross Reference
| OMC / Johnson / Evinrude | 0394411; 394411; 0778199; 778199 |
| Sierra | 18-1506 |
| RECMAR / 4Boats | REC394411 |
Frequently Asked Questions
Does it fit every 9.9 or 15 HP engine?
No. The verified small-engine application is the 1993–1995 Big Bore family.
Does 60–300 HP mean universal fit?
No. It covers selected older engine families only where the OEM reference matches.
What temperature is it?
62°C / 143°F nominal.
Is it genuine OMC?
No. It is a RECMAR aftermarket replacement.
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.
