HABIIID Outboard Thermostat Kit for Honda BF20–BF130 (1999–2003) — 72°C Opening, Gasket Included

This aftermarket thermostat kit replaces Honda part numbers 19300-ZV5-043 and 19351-ZV5-000 and is engineered to fit a wide range of BF20–BF130 engines from the late 1990s and early 2000s. The kit includes a high-quality thermostat and a matching gasket designed to restore correct engine cooling regulation and provide long service life and reliable sealing compared with worn factory components.

Which Honda engines does this HABIIID kit fit?

This kit is made for many 4-stroke Honda outboards produced around 1999–2003. It suits smaller models up to larger mid-range engines so you can replace the thermostat across multiple hulls without hunting different part numbers.

• Fits BF20A, BF25A, BF25D, BF30A, BF30D models.
• Compatible with BF35A, BF40A, BF40B, BF40D variants.
• Also fits BF45A, BF50A, BF50D and BF75A, BF75D models.
• Works for BF90A, BF90D, BF115A and BF130A 4-stroke engines (1999–2003).

How does the thermostat temperature rating affect engine performance?

The thermostat opens at 72°C (161.6°F), a common set point for these Honda outboards that helps the engine reach and maintain optimal operating temperature. A correctly operating thermostat reduces cold running wear and prevents overheating when fully open.

• 72°C opening reduces prolonged cold-idling and supports efficient combustion.
• Proper thermal control protects internal components and improves fuel efficiency.
• A precise opening temperature prevents premature overcooling or overheating.

What comes with the HABIIID kit and what materials are used?

The kit contains a precision thermostat and a purpose-cut gasket to ensure a tight seal in the housing. Both parts are manufactured to meet aftermarket durability standards so they resist corrosion and maintain fit over many seasons of use.

• Thermostat calibrated to 72°C with corrosion-resistant finish.
• High-quality gasket shaped to match OEM sealing surfaces.
• Packaged to protect components during storage and shipping.

How easy is installation and what should a DIYer expect?

Installation follows the same steps as the OEM replacement: remove the housing, swap the old thermostat and gasket, then reassemble. Basic tools and routine mechanical skill are sufficient; verify torque specs and inspect the housing and coolant passages for debris while you’re in there.

• Direct-fit design eliminates modification or machining.
• Recommended: clean mating surfaces and replace old gasket entirely.
• Inspect impeller and coolant passages during thermostat service for complete cooling maintenance.

Who is this for: Boaters, mechanics, and fleet operators who own or service older Honda BF20–BF130 4-stroke outboards and need an affordable, reliable thermostat and gasket replacement. Choose this HABIIID kit when you want a direct-fit aftermarket part that restores correct temperature control, avoids the cost or delay of OEM sourcing, and pairs well with routine cooling-system maintenance.