BayStar HK4300-4 Hydraulic Marine Steering Kit

BayStar HK4300-4 Hydraulic Steering Kit

The Dometic HK43004 BayStar Hydraulic Steering Kit is the compact front mount hydraulic steering kit for single, non power assisted outboards up to about 150 HP on most fishing, bay, and family boats. It pairs the HH43144 BayStar 1.4 cu in helm and the popular HC46453 front mount outboard cylinder for smooth, reliable steering on typical outboard applications.

BayStar is an excellent upgrade over mechanical cable steering on smaller outboards that cruise and run at moderate speeds. For larger engines, higher speeds, or performance hulls, SeaStar or SeaStar PRO is usually recommended instead.

The updated -4 kit, which is the direct replacement for the HK4300A-3 kits, includes the new -4 helms redesigned with updated valve technology, more durable check valves, and a refined internal layout.

Key Benefits of the HK4300-4 Kit

• BayStar system for single non power assisted outboards up to approximately 150 HP when installed to Dometic guidelines.
• Smoother, more consistent steering feel and reduced torque steer compared to mechanical cable steering.
• Well suited to everyday cruising, fishing, and family use on most smaller outboard powered boats.
• Balanced front mount cylinder design for even wheel effort port and starboard.
• BayStar 1.4 cu in helm provides a comfortable number of turns lock to lock with the HC4645H cylinder.
• Compact helm and smaller diameter hoses help with tight rigging spaces and narrow consoles.
• Meets applicable ABYC and NMMA steering standards when installed per BayStar instructions.

What Is Included in the HK4300-4 Kit

Important: This kit ships without steering hoses. BayStar kits use standard Dometic outboard hoses, which must be ordered separately to complete the installation.

Recommended Applications and Limits

Not intended for surfacing propeller applications, race boats, or high performance bass boats. For those applications, SeaStar PRO is usually the correct choice.

Will This Kit Work on My Boat?

Need a Different Cylinder?

You can purchase one of the Conversion Kits below to change out the HC4645-3 for another BayStar cylinder

Downloads and Resources

Installation Tips

• Confirm that your engine is listed for the HC4645H cylinder in the current SeaStar / BayStar application guide.
• Mount the HH4314-4 helm on a flat, reinforced dash with the correct 3 inch hole and a secure backing plate if needed.
• Route hoses to avoid tight bends, pinch points, chafe, and heat sources. Keep bend radii as large as practical.
• Use only Dometic approved fittings and hoses rated for BayStar and SeaStar outboard systems.
• Bleed the system carefully until there is no visible aeration and the wheel feels solid from lock to lock.
• Verify full engine movement port to starboard, correct centering, and that there is no interference at the cylinder or tiller arm.

Maintenance Guidelines

• Check fluid level at the helm periodically and top up with Dometic hydraulic steering fluid only.
• Inspect the cylinder shaft, seals, and hose fittings for signs of seepage at regular service intervals.
• Rinse the cylinder and fittings with fresh water after salt water use when possible.
• Do not use automotive power steering fluid or ATF. Always use Dometic specified steering fluid.
• If the wheel develops free play, noise, or a spongy feel, schedule a steering inspection before your next trip.

Frequently Asked Questions

Does this kit include hoses?
No. The HK4300-4 kit includes the BayStar helm, front mount cylinder, fluid, and bleed kit. Hoses are sold separately so you can match your exact rigging length and style.

What is the difference between BayStar HK4300-4 and SeaStar HK6400-4?
HK4300-4 is the BayStar kit for typical single outboard boats up to about 150 HP and moderate speeds. HK6400-4 is the SeaStar kit for larger or heavier boats up to about 300 HP and somewhat higher speeds. For high performance hulls and higher speeds, SeaStar PRO kits are usually recommended.

Can I upgrade from BayStar to SeaStar later?
Yes. Many customers start with BayStar and later upgrade to SeaStar when they increase engine power, boat size, or operating speeds. Contact us with your current part numbers and we can help you plan the upgrade path.

Can I add a second station with BayStar?
No. BayStar is intended for single station installations. For dual station boats, a SeaStar system is required.

Questions?

• Tech Support: Tech Support Page
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