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Powerhead Bolt Kit

J/E V4 V6 X-flow 79 & Up 8Bolts, 4Nuts, 9Washers
Item#:
350
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
24.67
Each

Pro Marine Yamaha Suzuki Mercury 122°F Thermostat F12411

Aftermarket 50°C Thermostat for F115, HPDI, DF100A-DF300 & 115 EFI

Pro Marine 122°F / 50°C Outboard Thermostat

Yamaha, Suzuki & Mercury 122°F / 50°C Thermostat - Pro Marine F12411

The Pro Marine F12411 Thermostat is an aftermarket 122°F / 50°C outboard engine thermostat for a broad range of Yamaha, Suzuki and Mercury applications.

Verified fitment includes select Yamaha F115 / LF115 four-strokes and 200-300HP HPDI engines, extensive Suzuki DF100A through DF300AP four-stroke applications, and select Mercury 115HP EFI outboards.

This thermostat cross references Yamaha 60V-12411-00-00 and 68V-12411-00-00, Suzuki 17670-90J20 / 17670-90J21, Sierra 18-3525, and multiple Mercury OEM numbers listed below.

OEM & Cross Reference Numbers

Brand / Type Part Number
Pro Marine F12411
Yamaha OEM 60V-12411-00-00
Yamaha OEM 68V-12411-00-00
Suzuki OEM 17670-90J20
Suzuki OEM 17670-90J21
Sierra 18-3525
Mercury OEM 8M0175320
Mercury OEM 8M6010295
Mercury OEM 8M6013864
Mercury OEM 881429

Yamaha Fitment

Major Yamaha Engine Families:

F115 / LF115 four-stroke, VZ200, VZ225, VZ250, VZ300 HPDI, Z250 / Z300 HPDI and LZ250 / LZ300 counter-rotation HPDI engines.
Yamaha Engine Family Verified Application Coverage
F115 Four-Stroke Extensive 2000 and later F115 applications including F115TLR, F115TXR, F115TJR, F115JA, F115LA, F115XA and related configurations.
LF115 Counter-Rotation Extensive 2000 and later LF115 applications including LF115TXR, LF115XA and related counter-rotation configurations.
VZ200 HPDI Select 2005 and later VZ200TLR and VZ200RTLR applications.
VZ225 HPDI Select 2003 and later VZ225TLR and VZ225HTLR applications.
VZ250 HPDI Select 2003 and later VZ250TLR and VZ250FTLR applications.
VZ300 HPDI Select 2004 and later VZ300TLR and VZ300BTLR applications.
Z250 / LZ250 HPDI Select 2003 and later Z250 and counter-rotation LZ250 TUR / TXR applications.
Z300 / LZ300 HPDI Select 2004 and later Z300 and counter-rotation LZ300 TUR / TXR applications.

Suzuki Fitment

Suzuki Engine Family Verified Application Coverage
DF100A Select DF100A and DF100AT applications beginning with 2013 and later model / serial families.
DF115A Select DF115A, DF115AT, DF115AST and DF115AZ applications.
DF140A Select DF140A, DF140AT and DF140AZ applications.
DF150 Select DF150, DF150AP, DF150AS, DF150AST, DF150AT and DF150AZ applications including later model / serial families.
DF175 Select DF175, DF175AP, DF175AT and DF175AZ applications.
DF200A Select DF200A, DF200AP, DF200AST, DF200AT and DF200AZ applications.
DF250A Select DF250A, DF250AP and DF250ATSS applications.
DF300A / DF300AP Select DF300A and DF300AP applications including later serial families.

Mercury 115HP EFI Fitment

Engine Serial Range
Mercury 115HP EFI 0T178500 thru 0T800999
Mercury 115HP EFI 0T801000 thru 1B226999
Mercury 115HP EFI 1B227000 thru 1B366822
Important Fitment Note:

Thermostat fitment can vary within the same horsepower and engine family. Verify the complete engine model / serial number and confirm that the original thermostat cross references one of the OEM numbers listed above.

This thermostat is rated at approximately 122°F / 50°C.

OEM Thermostat Options

Prefer an OEM thermostat? Pro Marine stocks both the Yamaha OEM and Suzuki OEM versions of this thermostat family.

Yamaha OEM Thermostat

Yamaha OEM F12411-1 122°F / 50°C Thermostat

Genuine Yamaha OEM thermostat for compatible Yamaha engines using 60V-12411-00-00 or 68V-12411-00-00.

View Yamaha OEM Thermostat

Suzuki OEM Thermostat

Suzuki OEM 17670-90J21 50°C / 122°F Thermostat

Genuine Suzuki OEM thermostat for compatible Suzuki applications using 17670-90J20 or 17670-90J21.

View Suzuki OEM Thermostat

What This Thermostat Does

The thermostat regulates cooling-water flow through the engine so the powerhead can reach and maintain the correct operating temperature.

When the engine is cold, the thermostat restricts cooling-water flow. As the engine reaches approximately 122°F / 50°C, the thermostat begins opening to allow additional cooling water to circulate.

Proper thermostat operation helps support correct engine warm-up, fuel management, combustion quality and overall cooling-system performance.

Common Signs of a Thermostat Problem

  • Engine running hotter than normal
  • Overheat alarm or warning
  • Thermostat stuck closed and restricting cooling water
  • Engine running too cool because the thermostat is stuck open
  • Salt, mineral or corrosion buildup
  • Damaged thermostat spring or valve
  • Thermostat does not open at the correct temperature during testing

Why Choose the Pro Marine F12411?

  • Pro Marine aftermarket 122°F / 50°C thermostat
  • Cost-effective alternative to OEM Yamaha and Suzuki versions
  • Replaces Yamaha 60V-12411-00-00
  • Replaces Yamaha 68V-12411-00-00
  • Replaces Suzuki 17670-90J20 and 17670-90J21
  • Cross references Sierra 18-3525
  • Cross references Mercury 8M0175320
  • Cross references Mercury 8M6010295
  • Cross references Mercury 8M6013864
  • Cross references Mercury 881429
  • Fits select Yamaha F115 / LF115 four-strokes
  • Fits select Yamaha 200-300HP HPDI engines
  • Fits select Suzuki DF100A-DF300AP applications
  • Fits select Mercury 115HP EFI engines
  • Yamaha OEM and Suzuki OEM options linked above

FAQ

What temperature is the Pro Marine F12411 thermostat?
It is rated at approximately 122°F / 50°C.

Is F12411 an OEM thermostat?
No. F12411 is the Pro Marine aftermarket version. Genuine Yamaha and Suzuki OEM options are linked above.

Does F12411 fit Yamaha F115?
Yes. The supplied fitment includes numerous F115 and LF115 four-stroke applications beginning with 2000 model families and continuing into later applications.

Does it fit Yamaha HPDI engines?
Yes. Verified fitment includes select VZ200, VZ225, VZ250, VZ300, Z250, Z300, LZ250 and LZ300 HPDI applications.

Does this fit Suzuki DF100A, DF115A and DF140A?
Yes. Extensive applications are included for all three families.

Does it fit Suzuki DF150, DF175 and DF200A?
Yes. The supplied fitment includes numerous standard, AP, AT, AZ and related configurations.

Does it fit Suzuki DF250 and DF300?
Yes. Select DF250A / AP / ATSS and DF300A / AP applications are included.

Does this fit Mercury 115HP EFI?
Yes. Verified applications include serial ranges 0T178500 thru 0T800999, 0T801000 thru 1B226999, and 1B227000 thru 1B366822.

What Yamaha OEM thermostat numbers does F12411 replace?
It cross references 60V-12411-00-00 and 68V-12411-00-00.

What Suzuki thermostat numbers does it replace?
It cross references 17670-90J20 and 17670-90J21.

Is a Yamaha OEM version available?
Yes. The Yamaha OEM F12411-1 thermostat is linked above.

Is a Suzuki OEM version available?
Yes. The genuine Suzuki 17670-90J21 thermostat is also linked above.

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on orders over $100 continental U.S.
  • Orders ship via UPS, USPS, and FedEx.
  • Orders received before 5:30 PM EST ship the same business day.
  • Typical delivery time is 1-5 business days.

30-Day Return Policy

  • Returns accepted within 30 days of delivery.
  • Parts must be new, unused, and in original packaging.
  • Installed parts are not returnable.
  • Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000

Searchable Terms

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Item#:
F12411
Cross Reference#:
F12411-1
17670-90J20
17670-90J21
18-3525
60V-12411-00-00
68V-12411-00-00
8M0175320
8M6010295
8M6013864
881429
Manufacturer Item:
60V-12411-00-00
Manufacturer:
Pro Marine
Available:
In Stock
43.1240
Your Price:
37.95
Each

Gasket, Exhaust Divider Plate

Mercury 135-200 2.5L SportJet, 200,210,240
Item#:
2727
Cross Reference#:
18-2735
18-2735
190506
190506
Manufacturer Item:
190506
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
16.54
Each

Bearing, Rod Caged

Johnson/Evinrude 18-75hp 2-3 Cylinder
Item#:
344
Cross Reference#:
0306250
0322144
0378223
0378528
0388188
0388342
0388344
0436932
0437088
0777359
16400
17514
17514A1
17514A2
17514B2
18-1378
306250
322144
378223
378528
388188
388342
388344
388344
436932
437088
67526
67526A1
67526A2
777359
8M0045428
8M0045430
8M0234886
814337A1
821146A1
879366
Manufacturer Item:
388344
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
32.13
Pair

Gasket, Reed Plate

Mercury 175 Pro XS, 200/2.5XS 225X Pro Max, SportJet 200/240
Item#:
2722
Cross Reference#:
10-2722
516-44
840484
Manufacturer Item:
840484
Manufacturer:
Pro Marine
Available:
Out of Stock
ETA:
10/21/2026
Your Price:
23.10
Each

Cable Tie Mount 100 Pack

#8 Screw Hole Fits Most Cable Tie Sizes
Item#:
CTM
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
16.43
Pack

Gasket, Air Horn Plenum

Mercury 115-200 EFI/DFI Sport Jet 200 DFI
Item#:
2723
Cross Reference#:
10-2723
516-31
850058
8500581
Manufacturer Item:
8500581
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
18.64
Each

Gasket, Expansion Chamber

SportJet 200-250hp
Item#:
2720
Cross Reference#:
10-2720
510-29
859397
879864
880738
Manufacturer Item:
880738
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
14.54
Each

Powerhead Bolt Kit

J/E 60Deg Eagle / Ficht FFI 12Bolts, 10Washers
Item#:
358
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
22.61
Each

Bearing, Needle Dealer Pack

Mercury L3 L4 500 Needles
Item#:
WP42DP
Cross Reference#:
8M0214954
818391
818391001
Manufacturer Item:
818391
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
91.65
Each

Powerhead Bolt Kit

J/E V4 Looper 10Bolts, 3Nuts, 13Washers
Item#:
357
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
22.61
Each

Powerhead Bolt Kit

Yamaha V6 225hp, 250hp
Item#:
356
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
23.51
Each
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