Seastar Cylinder Baystar Compact HC4645H

$756.00 $680.40 inc GST

or 4 fortnightly payments of $170.10 with Afterpay More info

Cylinder Capacities – SeaStar Solutions Part No. HC4645H

Cylinder only.

SKU: 291071 Category:


Condition:  New

In stock

Due to size - item will be posted regular post.



Cylinder Capacities – SeaStar Solutions Part No. HC4645H

Cylinder Capacities – SeaStar Solutions Part No. HC4645H

Cylinder Model: Front Mount

Bore: 1.25″ / 31.7mm

Shaft Dia.: .625″ / 15.9mm

Stroke: 8″ / 203mm

Volume: 118.6cc / 7.2in3

Torque: N/A

BayStar™?hydraulic steering is brought to you by the manufacturers of SeaStar®, the most trusted name in pleasure boat steering. BayStar allows you to install all of the safety, reliability and comfort of hydraulic steering onto your boats rated up to MAX. 150HP as rated by the engine manufacturer. Combine this with the superior SeaStar Solutions design team, rigid ISO quality control and teamed with the finest materials and precision manufacturing—BayStar continues the tradition bringing comfort and safety to boating.

The BayStar steering system consists of a super low friction helm for smooth comfortable steering, a balanced cylinder–featuring a compact design that fits most splashwells. For your convenience two lengths of 20’ cut to fit tubing are supplies (2 x 20’ length), two bottles of hydraulic steering fluid, and one fill tube for easy fill and purge.

BayStar is NOT recommended in applications with high steering effort (i.e. such as those using high performance engines or boats capable of attaining high speeds), customers should consider upgrading the system to SeaStar/SeaStar Pro steering . This will reduce the steering effort due to the fact that SeaStar steering provides more output power resulting in lower steering effort.

• Patented No FeedBack™ Steering lock valves.
• 5 turns lock-to-lock.
• Up to 150 horsepower (total).
• Available either as separate components or as a complete system ready to install.
• Fixed cylinder.
• BayStar hydraulic tubing cut to suit application.
• Tilt option available.
• Requires 3” (76mm) cut-out hole in dash.
• Requires 21” (534mm) splashwell width.

DO NOT use BayStar on smaller HP outboard engines that use wing nut type transom mount clamping screws.

Tilt Helm HH4315 is available separately. Currently not available in kit form.



(Cylinders HC4645H/47H/48H/58H)

FORCE1985–DATE90–150 HPHC4645H
HONDA1992–DATE30–90 HPHC4645H
1998–2009115–130 HPHC4647H
2001–DATE150 HPHC4645H
2003–DATEBF135 HPHC4645H
2010–DATE115–150 HPHC4645H
JOHNSON / EVINRUDE1977–199065–150 HPHC4648H
1991–DATE40–150 HPHC4645H
1997–DATE115 HP FICHTHC4658HSee Notes 4, 5
1997–DATE75–150 HP FICHTHC4645H
1998–DATE40–140 HP 4-StrokeHC4658HSee Notes 1, 4
NISSAN1990–DATE120–140 HPHC4645H
1996 ONLY115–140 HPN/A
1987–2002115–140 HPHC4645HSee Note 1
1990–200090–100 HPHC4645H
1998–DATE40–70 4-StrokeHC4645HSee Note 1
2001–DATE115–140 HP 4-StrokeHC4658HSee Notes 1, 4
TOHATSU1990–DATE40–140 HPHC4645H
YAMAHA1998–DATE40–50 HPHC4645HSee Note 2
1998–DATE60 HPHC4645HSee Note 3
1986–DATE70–90 HPHC4645HSee Note 1
1997–DATE80–150 HP 4-StrokeHC4645H
2000–DATE25–60 HP 4-StrokeHC4648HSee Note 1
2010–DATE70HP 4-StrokeHC4648H
1997–2013115A 4-STROKEHC4658H
2014-DATE115B 4-STROKEHC4645H
YANMAR1990–DATE27–36 HPHC4645H

1. Requires Spacer kit part # HO5090
2. Engine clamp brackets must be cut or ground, and the engine through bolted onto the transom, or interference will occur, restricting engine trim and tilt.
3. Steering hook Yamaha Part # 63D-48511-00-4D must be installed
4. Cylinder HC4645 may be used in these applications. The pivot plate will need to be flipped before installation.
Instructions provided with Owner’s Manual.
5. Johnson 115 HP 2-Stroke enginnes, require the pivot plate to be flipped. See Note #4.



Part# HC4645H, HC4647H, HC4648H and HC4658H
Balanced cylinder, featuring a compact design that fits most splashwells.

Part# HC4600
(No Longer Available. Replacement parts still available)
Balanced cylinder that fits most splashwells.

Additional Parts Available separately:


Part# HH4314
Super low friction helm for smooth comfortable steering.


Complete BayStar™ steering kit (291561) providing the flexibility to enable the installer the ability to make whatever hydraulic hose length required, without the need for specialist swaged fittings. The two unique re-usable brass end fittings allow the installer to simply cut the hose to length and insert the brass connectors. Complete kit includes 50 foot length of outboard hose, BayStar™ helm, BayStar™ front mount cylinder, hydraulic oil, rubber boot and two re-usable hose fittings.

Cylinder Baystar Steering Kit 291561

291071Cylinder Capacities – SeaStar Solutions Part No. HC4645HCylinder Model: Front Mount Bore: 1.25″ / 31.7mm Shaft Dia.: .625″ / 15.9mm Stroke: 8″ / 203mm Volume: 118.6cc / 7.2in3 Torque: N/A
291490Front Helm Pump – 1.4 Front MountDisplacement: 22.9cc / 1.4cu in Relief Valve Setting: 70bar / 1000psi
291902Hydraulic Oil – 1L
293001Adjustable Outboard Hose Kit – Rubber BootQty Req.: 1
29305050′ Seastar Standard Outboard Hose
297332Re-usable Hose Fitting.
Additional information

Additional information

Weight3 kg

Baystar, SeaStar



Price does not include shipping. Product will be shipped via Toll / Australia Post / Courier. Product can also be collected.



Shipping & Delivery

Prices do not include shipping.

$12 Express Shipping for all items up to 3kg - Australia Wide*

$10 Express Shipping for all items up to 500g - Australia Wide

$9 Brisbane - Postcodes 4000-4209, 4270-4299, 4500-4549, 9000-9725 up to 22kg

Boat Hut uses Toll Ipec Priority Service, Australia Post Express Post and Courier's Please. Boat Hut uses Australia Post's Express Courier International Service for New Zealand deliveries.

Free Local Pickup – by prior arrangement. We don’t always have all products at our Acacia Ridge premises but they may be at our warehouse. The warehouse does not usually permit customer collections.

Order Tracking provided on all orders.

All orders will be processed within 2 business days - except backordered items. If we are unable to meet this timeframe we will contact you to provide details and options. If we are unable to ship your order within 3 business days we will offer you a refund in full or the option to wait for the goods to come into stock.

We are happy to ship to any country - and will provide a quote upon request. All overseas orders must be paid for via Paypal before your order is shipped.

Above pricing refers to regular size items that will fit in courier satchels - oversized items will require a freight quote.

Boat Hut reserves the right to refuse to fulfil an order that has the incorrect postage / freight collected at the time of sale. We will work with you to rectify the matter, if we are unable to come to a resolution then we will provide a refund in full.