Thermostat Kit 60°C 6G8-12411 66M-12411 for Yamaha Mercury Mariner Honda Outboard 140°F — Germany Local Warehouse
Thermostat Kit 60°C 6G8-12411 66M-12411 for Yamaha Mercury Mariner Honda Outboard 140°F — Germany Local Warehouse
Product Overview
Thermostat kit part opening at 60 °C / 140 °F for Yamaha, Mercury, Mariner and Honda outboards, one kit per pack at 63 g. It replaces Yamaha 6G8-12411-00-00 and 66M-12411-00-00, Mercury 855676A1, Honda 19300-881-741, and crosses to Sierra 18-3541, 18-3611 with gasket and 18-3642. Dispatched from our Germany local warehouse.
Sixty degrees is the cold rating the Japanese four stroke range and the Mercury carburettor motors were built around. It opens early and keeps the block cool, which is why an automotive thermostat rated at 82 °C is the wrong part for an outboard: on a long run the engine never sheds the heat it makes.
The same body is sold under three brand families, so check the number stamped on the old thermostat and on the housing before ordering. While the cover is off, look at the seal faces for corrosion pitting, and check the impeller at the same service, because an overheating outboard is more often the pump than the thermostat.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Outboard thermostat kit |
| Opening Temperature | 60 °C / 140 °F |
| Application | Yamaha, Mercury, Mariner, Honda outboards |
| Net Weight | 63 g |
| Pack Size | 150 x 100 x 40 mm / 5.9 x 3.9 x 1.6 in |
| Country of Origin | Taiwan |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Yamaha | 6G8-12411-00-00, 6G8-12411-01-00, 6G8-12411-02-00, 6G8-12411-03-00 |
| Yamaha | 66M-12411-00-00, 66M-12411-01-00 |
| Yamaha | 6AH-13411-00-00, 6E5-12411-00, 6E5-12411-01, 6E5-12411-02 |
| Mercury / Mariner | 825212, 824853, 855676, 855676A1, 825212A1 |
| Mercury / Mariner | 825212001, 855676003, 825212T02 |
| Honda | 19300-ZW9-003, 19300-881-741, 19300-921-003 |
| Sierra | 18-3541, 18-3611 with gasket, 18-3642, 18-3628-1, 18-3629 |
Compatible Engines
| Brand | Model | Horsepower | Years |
|---|---|---|---|
| Yamaha | F2.5 | 2.5 HP | 2022 to 2023 |
| Yamaha | F4 | 4 HP | 1999 to 2023 |
| Yamaha | F6 | 6 HP | 2001 to 2023 |
| Yamaha | F8, T8 | 8 HP | 1999 to 2023 |
| Yamaha | F9.9, T9.9 | 9.9 HP | 1985 to 2023 |
| Yamaha | F15 | 15 HP | 1998 to 2006 |
| Yamaha | F25, T25 | 25 HP | 1998 to 2023 |
| Yamaha | F30 | 30 HP | 2001 to 2021 |
| Yamaha | F40 | 40 HP | 1999 to 2023 |
| Yamaha | F50, T50 | 50 HP | 1995 to 2023 |
| Yamaha | F60, T60 | 60 HP | 2002 to 2023 |
| Yamaha | F70 | 70 HP | 2006 to 2023 |
| Yamaha | F80 | 80 HP | 1999 to 2000 |
| Yamaha | F100 | 100 HP | 1999 to 2000 |
| Yamaha | XF425 | 425 HP | 2006 to 2023 |
| Yamaha | XF450 | 450 HP | 2023 and up |
Honda and Mercury Coverage
| Brand | Horsepower | Note |
|---|---|---|
| Honda BF | 8 HP, 9.9 HP, 15 HP, 20 HP, 25 HP, 30 HP | Carburettor and EFI four stroke |
| Honda BF | 40 HP, 50 HP, 60 HP, 75 HP, 90 HP | Carburettor and EFI four stroke |
| Honda BF | 100 HP, 200 HP, 225 HP | Carburettor and EFI four stroke |
| Mercury / Mariner | 8 HP, 9.9 HP, 15 HP, 25 HP, 30 HP, 40 HP, 45 HP, 50 HP | See serial ranges below |
Mercury Serial Ranges
| Model | Serial Range |
|---|---|
| 8 HP carburettor | 0H000058 and up |
| 9.9 HP carburettor | 0H000058 to 0G760300 |
| 15 HP carburettor | 1B227000 to 0G760300 |
| 25 HP four stroke, 2002 to 2006 | 0T409000 to 1B344298 |
| 30 HP EFI, 2007 and up | 1C109093 to 0G760300 |
| 30 HP carburettor, 2007 and up | 1B226999 to 0G760300 |
| 40 HP carburettor, 2002 and up | 1C000001 and up |
| 40 HP EFI, 2002 and up | 1B226999 to 0T409000 |
| 45 HP carburettor | 0T178499 to 0G760300 |
| 50 HP carburettor | 0T178499 to 0G760300 |
What's Included
| Component | Qty |
|---|---|
| Thermostat kit as shown in the photographs | 1 |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Shipping from Germany
| Destination | Warehouse | Note |
|---|---|---|
| Germany | Germany local warehouse | Domestic delivery, no import duty |
| Austria, Netherlands, Belgium | Germany local warehouse | EU intra-community delivery |
| France, Italy, Spain, Poland | Germany local warehouse | EU intra-community delivery |
Before You Buy
- Check the number on the old thermostat and on the housing, three brands are covered here
- Check the rating, this one opens at 60 °C and 140 °F, hot running motors use a different one
- Check the housing and cover for corrosion pitting on the seal faces
- Check the impeller at the same service, an overheating motor is often the pump
- Fit the thermostat the right way round, spring end toward the hot side
- Run on muffs and watch the head temperature climb and then hold steady
- 30-Day Easy Returns
- Ships from our Germany local warehouse
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