Multiflex Complete Light Duty Steering Kit

The Multiflex H2, SC-18 and Alpha Complete Mechanical Steering Kit combines an H2 Lite 55 reduction-gear helm, a B3B 90° black dashboard bezel, an SC-18 steering cable in the selected length and a 350mm Alpha steering wheel. Choose the black W1B or white W1W wheel. Designed for compatible mechanical steering installations with engines up to 55HP, the system provides approximately 2.5 steering-wheel turns and 228mm / 9in cable travel.

Product Identification

• Brand: Multiflex
• Product category: Complete mechanical marine steering kit
• Base packaged steering system: MS2
• Base kit part-number format: MS2-XX
• Retail bundle configurations: MS2-XX + W1B or MS2-XX + W1W
• Steering helm: Multiflex H2
• Helm series: Lite 55
• Helm design: Mechanical reduction-gear helm
• Dashboard bezel: Multiflex B3B
• Bezel colour: Black
• Bezel installation angle: 90°
• Steering cable: Multiflex SC-18
• Cable part-number format: SC-18-XX
• Cable length: Selected when ordering
• Black steering wheel: Multiflex Alpha W1B
• White steering wheel: Multiflex Alpha W1W
• Steering-wheel diameter: 350mm / 13.8in
• Steering-wheel construction: High-strength engineered plastic
• Steering-wheel hub: Inbuilt
• Steering-wheel shaft fitting: Standard 19mm / 3/4in taper
• Maximum published system application: Compatible engines up to 55HP
• Combined retail-bundle manufacturer part number: Not assigned in the supplied product data

The XX suffix identifies the nominal SC-18 steering-cable length in feet. For example, an MS2-12 package contains a nominal 12ft SC-18 cable.

Which Kit Options Are Available?

Choose the Alpha steering-wheel colour and required SC-18 cable length:

• Black-wheel kit: Multiflex H2 helm, B3B black bezel, selected SC-18 cable and W1B black Alpha steering wheel
• White-wheel kit: Multiflex H2 helm, B3B black bezel, selected SC-18 cable and W1W white Alpha steering wheel

Both options use the same H2 helm, B3B 90° black bezel and SC-18 cable. Only the Alpha steering-wheel colour changes.

The B3B dashboard bezel is black in both kit options. Selecting the white W1W steering wheel does not change the bezel to white. The grey W1G Alpha wheel is not included in this listing.

What Is Included in the Complete Steering Kit?

• One Multiflex H2 Lite 55 mechanical steering helm
• One Multiflex SC-18 steering cable in the selected length
• One Multiflex B3B 90° black dashboard bezel kit
• One Multiflex Alpha 350mm steering wheel in the selected colour
• W1B black steering wheel or W1W white steering wheel
• Inbuilt 19mm / 3/4in tapered steering-wheel hub
• One SP-T2 spent-cable tube / protective plastic sleeve
• One B3B black engineered-plastic bezel cup
• One MB-H2 helm mounting bracket
• Standard helm and bezel mounting hardware
• Steering-wheel retaining bolt and washer
• Dashboard mounting template
• MS2 installation manual
• H2 helm declaration of conformity
• SC-18 steering-cable declaration of conformity

The official Alpha product information confirms an inbuilt hub but does not separately itemise a loose wheel centre cap. A centre cap should therefore only be advertised as supplied where confirmed from the physical stock package.

This package supplies the primary steering-control components from the steering wheel and helm through to the engine-side SC-18 cable output.

What Is Not Included?

• Engine-specific steering connection kit or drag link
• Outboard engine steering arm
• Engine tilt-tube service parts
• Transom support
• Splashwell steering-cable mount
• Steering-cable clamp block
• Rudder or tiller link arm
• B3W white dashboard bezel
• W1G grey Alpha steering wheel
• Dashboard reinforcement
• Installation-specific fittings not listed in the package contents
• Professional installation

Check the boat, engine and intended steering arrangement before ordering to establish which engine-side connection and cable-support components are required.

What Is This Complete Steering Kit Used For?

The Alpha steering wheel provides the operator’s steering input. The H2 helm converts wheel rotation into movement of the SC-18 cable’s helical inner member, and the SC-18 cable converts that movement into linear push-pull travel at the engine, rudder or compatible mechanical steering linkage.

The complete kit is intended for correctly specified installations including:

• Small powerboats
• Compatible single-outboard installations
• Leisure boats
• Fishing boats
• RIBs with suitable mechanical steering geometry
• Light-duty single-cable mechanical steering
• Compatible engines up to 55HP
• Dashboards requiring a 90° black bezel
• New steering-system installations
• Replacement of compatible H2, MS2 or SC-18 steering systems

The 55HP figure is the maximum published application for the MS2 system. It is not confirmation that the kit fits every 55HP engine or boat. Final suitability depends on the boat manufacturer’s horsepower rating, engine steering geometry, operating load, cable route, engine connection and the rating of every installed component.

Does the Alpha Steering Wheel Fit the H2 Helm?

Yes. The H2 helm has a standard 19mm / 3/4in tapered steering-wheel shaft, and the Alpha W1B and W1W wheels have an inbuilt hub designed for standard marine helms with a 3/4in tapered shaft.

The H2 permits:

• Maximum steering-wheel diameter: 406mm / 16in

The included Alpha wheel measures:

• Diameter: 350mm / 13.8in
• Number of spokes: Three
• Hub: Inbuilt
• Hub fitting: Standard 19mm / 3/4in taper

The 350mm Alpha wheel is therefore within the H2’s published maximum wheel-diameter limit. The current official W1B and W1W data do not publish the wheel depth, so dashboard, instrument, control and windscreen clearance must be checked before installation.

Does the SC-18 Cable Need an Adaptor?

No separate adaptor is required between the included Multiflex H2 helm and SC-18 steering cable.

The SC-18 helical inner member is inserted into the H2 helm and drawn into the internal gear mechanism by rotating the steering wheel. Its threaded cable-end fitting is then secured to the helm connection, and the exposed helical section is covered by the supplied SP-T2 protective sleeve.

Multiflex publishes the following cross-references:

• H2 helm: SeaStar / Dometic SH8050
• H2 helm: Ultraflex T67
• SC-18 cable: SeaStar / Dometic SSC131
• SC-18 cable: Ultraflex M58
• B3B bezel: SeaStar / Dometic SB39452P
• B3B Ultraflex equivalent: None listed

These cross-references are selection guides rather than automatic interchangeability guarantees. Confirm the helm connection, cable retention method, cable travel, selected length, engine-side fitting and dashboard dimensions before substituting another manufacturer’s component.

Is the Kit Suitable for Any 55HP Engine?

No. The MS2 is published for compatible engines up to 55HP, but horsepower alone does not determine fitment.

Before ordering or installing the kit, confirm:

• The boat manufacturer permits the intended engine horsepower
• The engine supports a compatible mechanical steering connection
• The SC-18 output end suits the selected engine-side hardware
• The cable provides sufficient travel
• The cable can follow the required route without tight bends
• The engine can reach its full port and starboard positions
• The outboard can move through its complete tilt range without pulling or binding the cable
• The Alpha wheel has sufficient clearance at the helm station
• Every component is rated for the completed installation

The permitted system rating is determined by the boat manufacturer and the lowest-rated component in the complete steering installation.

Steering-System Performance

• Maximum published application: Compatible engines up to 55HP
• Steering-wheel movement: Approximately 2.5 turns through full travel
• SC-18 cable travel: 228mm / 9in
• MS2 system minimum cable bend radius: 250mm / 9.8in
• Maximum working load at tiller end: 5,000N / 500kg
• Included steering-wheel diameter: 350mm / 13.8in
• Maximum permitted steering-wheel diameter: 406mm / 16in
• Helm-shaft length: 37.5mm
• Steering-wheel shaft: Standard 19mm / 3/4in taper
• Dashboard installation angle: 90°
• Number of steering cables: One
• Helm mounting positions: Five positions at 45° intervals
• Published operating temperature: -20°C to +60°C
• Maximum boat speed: Not stated in the current official MS2 product data or installation manual
• Feedback characteristic: Reduction-gear system designed for higher efficiency and lower feedback
• Non-reaction function: Not specified; the H2 is not identified as a non-reaction helm

The Alpha steering wheel does not increase the horsepower rating of the system. Engine capacity is determined by the complete steering arrangement rather than the wheel alone.

What Are the Features of the SC-18 Steering Cable?

• Multiflex SC-18 mechanical steering cable
• Part-number format SC-18-XX
• XX identifies nominal cable length in feet
• Directly specified for the H2 helm
• Used in the MS2 Lite 55 package
• Mechanical push-pull cable construction
• Helical inner member at the helm end
• Threaded helm-end cable fitting
• Stainless-steel output ends
• 228mm / 9in complete-system travel
• Standalone cable minimum bend radius of 8in / approximately 203mm
• Complete MS2 system minimum bend radius of 250mm / 9.8in
• Exceeds ISO 9775
• SeaStar / Dometic SSC131 cross-reference
• Ultraflex M58 cross-reference

Although the standalone SC-18 product page states an 8in minimum bend radius, the dedicated MS2 installation manual specifies a larger 250mm / 9.8in minimum for the complete H2 and SC-18 system. The more conservative 250mm system limit should therefore be followed for this kit.

How Do You Select the Correct SC-18 Cable Length?

Measure dimensions A, B and C along the intended steering-cable route in centimetres. Count the number of 90° bends and establish whether the cable will pass through the engine tilt tube or use a transom or splashwell support.

For installation through an engine tilt tube:

• 1. Add dimensions A + B + C.
• 2. Subtract 10cm for each 90° bend.
• 3. Add 30.5cm for the engine tilt-tube installation.
• 4. Divide the result by 30.5 to convert the measurement to feet.
• 5. Round up to the next whole-foot cable length.

Formula: A + B + C − 10cm per 90° bend + 30.5cm.

For transom-support or splashwell mounting:

• 1. Add dimensions A + B + C.
• 2. Subtract 10cm for each 90° bend.
• 3. Divide the result by 30.5 to convert the measurement to feet.
• 4. Round up to the next whole-foot cable length.

Formula: A + B + C − 10cm per 90° bend.

For replacement installations, check the full model and length marking printed on the existing cable wherever possible. Do not order a cable shorter than the calculated measurement.

Alpha Steering-Wheel Construction

• Multiflex Alpha standard marine steering wheel
• Black W1B or white W1W option
• 350mm / 13.8in diameter
• Three-spoke design
• High-strength engineered-plastic construction
• Inbuilt steering-wheel hub
• Standard 19mm / 3/4in tapered helm fitting
• Suitable for the H2 helm’s standard tapered shaft
• Wheel depth not stated in current official product data
• Separate wheel-specific compliance standard not stated in current official product data
• Separate centre-cap contents not itemised in current official product data

The W1B and W1W have the same published construction and dimensions. Only the steering-wheel colour changes.

Helm, Bezel and Cable Construction

• H2 mechanical reduction-gear steering helm
• Internally meshed planetary gear arrangement
• Adjustable helm mounting position
• Five mounting positions at 45° intervals
• High-pressure die-cast aluminium-alloy helm cover
• High-pressure die-cast zinc-alloy gear and shaft
• Standard 19mm / 3/4in tapered steering-wheel shaft
• B3B black 90° engineered-plastic bezel
• SC-18 cable with stainless-steel output ends
• Mechanical helical cable-to-helm interface
• Direct H2-to-SC-18 connection
• SP-T2 protective sleeve for the spent helical cable section

The planetary arrangement distributes steering torque through multiple internally meshed gears, providing higher efficiency and lower feedback while retaining direct mechanical steering control.

Standards and Certifications

• MS2 steering system: Conforms to the Recreational Craft and Personal Watercraft Directive 2013/53/EU
• MS2 conformity standard: EN ISO 8848:1995/A1:2000
• SC-18 steering cable: Exceeds ISO 9775
• H2 declaration of conformity: Included in the official MS2 packing list
• SC-18 declaration of conformity: Included in the official MS2 packing list
• Alpha W1B/W1W wheel-specific standard: Not stated in the current official product pages

No wheel-specific CE, NMMA, UKCA, EN or ABYC claim should be added to this listing unless separately confirmed for the Alpha W1B or W1W.

Installation Notes

The Multiflex MS2 installation manual specifies:

• Dashboard thickness: 12.7–54mm / 0.5–2.1in
• Minimum clearance behind dashboard: 130mm
• Central dashboard cut-out: 83mm / 3.25in
• Dashboard mounting holes: Three holes, each 10mm / 3/8in
• Bezel-bracket mounting torque: 15Nm
• Helm-to-bracket mounting torque: 25Nm
• SC-18 cable fitting torque: 6Nm
• MS2 minimum cable bend radius: 250mm / 9.8in
• Recommended cable support interval: Approximately every 2m / 6ft
• Helm mounting positions: Five positions at 45° intervals

The installation manual contains conflicting steering-wheel retaining-bolt torque values. Follow the current instructions supplied with the actual H2 and Alpha wheel rather than relying on a single extracted value from the earlier manual edition.

Route the SC-18 cable away from:

• Sharp dashboard openings
• Cutting edges
• Heat sources
• Electrical wiring
• Moving engine components
• Areas where the conduit may be crushed
• Tight or unsupported bends

Do not secure the steering cable to electrical wiring.

After installation, confirm that:

• The selected SC-18 cable length is correct
• The Alpha wheel is securely fitted to the H2 tapered shaft
• The steering wheel clears the dashboard, controls and instruments
• The SC-18 cable is fully engaged with the helm
• The threaded cable fitting is securely retained
• The protective sleeve covers the exposed helical cable section
• The cable remains above the 250mm system bend-radius limit
• Clockwise wheel movement steers the boat to starboard
• Anticlockwise wheel movement steers the boat to port
• The engine or rudder reaches its complete steering range
• The cable does not bottom out before the steering mechanism reaches its stop
• Full steering movement remains available throughout the engine tilt range
• All bolts, nuts and fasteners are rechecked after the first two operating hours

Multiflex specifies steering-system servicing every 30 days for saltwater use and every 90 days for freshwater use, with specialist inspection at least every two years. Marine steering is safety-critical and installation should be completed by a competent marine technician using the current instructions.

Key Features

• Complete helm, bezel, cable and steering-wheel package
• Multiflex H2 Lite 55 steering helm
• Multiflex SC-18 cable supplied in the selected length
• Multiflex B3B 90° black bezel included
• Multiflex Alpha 350mm steering wheel included
• Choice of W1B black or W1W white wheel
• High-strength engineered-plastic wheel construction
• Three-spoke Alpha steering-wheel design
• Inbuilt steering-wheel hub
• Standard 19mm / 3/4in tapered wheel fitting
• Intended for compatible engines up to 55HP
• Mechanical reduction-gear steering
• Internally meshed planetary gear arrangement
• Approximately 2.5 steering-wheel turns
• 228mm / 9in cable travel
• 250mm / 9.8in complete-system minimum bend radius
• 5,000N / 500kg maximum tiller-end working load
• Maximum permitted steering-wheel diameter of 406mm / 16in
• Included Alpha wheel diameter of 350mm / 13.8in
• Included wheel is within the H2 diameter limit
• Five helm mounting positions at 45° intervals
• High-pressure die-cast aluminium-alloy helm cover
• High-pressure die-cast zinc-alloy gear and shaft
• Stainless-steel SC-18 cable output ends
• Direct H2-to-SC-18 connection
• No separate helm-to-cable adaptor required
• SC-18 cable exceeds ISO 9775
• MS2 conforms to Directive 2013/53/EU in accordance with EN ISO 8848
• Engine-specific steering connection components not included
• No maximum boat speed stated in the current official MS2 data

Frequently Asked Questions

Is the Alpha steering wheel included? Yes. The kit includes one 350mm Multiflex Alpha steering wheel in the selected W1B black or W1W white configuration.

Does the steering wheel have a hub? Yes. Multiflex specifies an inbuilt hub for the W1B and W1W Alpha wheels.

Does the Alpha wheel fit the H2 helm? Yes. The wheel and helm both use a standard 19mm / 3/4in tapered connection. The 350mm wheel is also below the H2’s 406mm maximum diameter.

Is a centre cap included with the Alpha wheel? The current official W1B and W1W product data do not separately itemise a centre cap. Confirm the contents of the physical stock package before advertising one.

Is the B3B bezel included? Yes. One B3B 90° black dashboard bezel and its standard mounting components are included.

Does the white-wheel kit include a white bezel? No. Both wheel options use the same black B3B bezel. Only the Alpha wheel changes from black W1B to white W1W.

Is the SC-18 steering cable included? Yes. One SC-18 cable in the selected nominal foot length is included.

Does the H2 need an adaptor for the SC-18 cable? No separate adaptor is required for the standard H2 and SC-18 combination.

What minimum cable bend radius should be used? Use the complete MS2 system limit of 250mm / 9.8in. This is more conservative than the standalone SC-18 cable page’s 8in value.

Can this kit be used on any 55HP engine? No. The 55HP figure is the maximum published application. The boat rating, engine steering arrangement, cable route and engine-side connection must all be compatible.

Can an Ultraflex M58 or SeaStar SSC131 replace the SC-18? Multiflex lists M58 and SSC131 as cross-references. Confirm the exact connection, retention arrangement, travel, length and engine-side fitting before substitution.

Is the engine connection kit included? No. Any required drag link, steering arm, clamp block, transom support or splashwell mounting component must be selected separately.

Does Multiflex state a maximum boat speed for the MS2? No maximum boat speed is stated in the current official MS2 product page or installation manual.