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664-42119-00 664-42119-00-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Marine Outboard Steering Handle Throttle Twist Grip Rubber |
| OEM & Interchange Part Numbers | 664-42119-00-00 / 664-42119-00 |
| Installation Location | Forward end of the steering tiller handle (Steering Handle / Control section) |
| Engine Platform | Inline-2 Cylinder 2-Stroke / 4-Stroke Tiller Control Marine Outboards |
| Horsepower Range | Yamaha 20HP, 25HP, 28HP, and 30HP 2-Stroke models (20D, 25B, 25J, 28A, 30A, etc.) |
| Design Configuration | Molded cylindrical rubber sleeve with internal interference ribs and exterior ribbed traction |
| Material Composition | Marine-grade high-tensile, UV-stabilized synthetic rubber (EPDM-NBR formulation) |
| Operating Conditions | Resists continuous solar UV rays, saltwater spray, gasoline/oil mist, and dynamic torsional torque |
2. Key Features & Functionality
Ergonomic Raised Traction Ribs: Styled with raised tactile ridges and micro-textured grooves to ensure a firm, non-slip grip even when hands or gloves are coated with sea spray, slime, or motor oil.
Tight Interference Anti-Twist Internal Fit: Internal bore tolerances provide high radial clamping friction against the throttle sleeve, preventing slip or spinning during rapid acceleration.
Anti-Gumming & UV Weathering Defense: Chemical compound engineered to resist ozone degradation and hydrocarbon exposure, preventing the rubber from deteriorating into a tacky, sticky mess in hot climates.
Vibration Isolation: Thick elastomeric profile absorbs high-frequency powerhead harmonics transmitted along the tiller arm, reducing operator hand fatigue during extended cruising.
3. Compatible Models
Primarily compatible with Yamaha 20HP–30HP 2-stroke tiller handle outboards:
Yamaha 2-Stroke Series: 20HP (20D), 25HP (25B, 25J, 25V), 28HP (28A), 30HP (30A, 30D, 30G)
Clone Engines: Compatible with Parsun (T25 / T30), Hidea (HD25 / HD30), Powertec, Seapro, and other outboard brands utilizing the Yamaha 689/664 tiller handle throttle assembly
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 20HP to 30HP tiller steering and twist-throttle systems.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-durability marine tiller hardware, rubber grips, throttle linkages, and steering components. This grip is molded using precision vulcanization molds and high-grade elastomeric compounds.
Direct OEM-Level Performance: Clamping tension, tactile grip depth, and weathering resistance meet or exceed OEM specifications, serving as the premier cost-effective choice for replacing sticky, torn, or spinning throttle grips.
5. Common Symptoms & Troubleshooting
Sticky, Gummy, or Disintegrating Rubber Surface:
Cause: Photo-chemical degradation from solar UV rays combined with fuel solvent exposure breaking down the polymer bonds.
Troubleshooting: Visually inspect and feel the grip; if it leaves black residue on hands or exhibits deep alligator cracking, replace it immediately.
Grip Spins Freely on Throttle Tube (No Throttle Response):
Cause: Loss of internal elasticity and stretch-out, or fuel/oil migration under the grip destroying internal friction.
Troubleshooting: Twist the grip firmly; if the rubber rotates without turning the inner plastic throttle sleeve, clean the substrate with alcohol and slide on a new grip.
Worn-Through Outer Edge / Exposed Inner Tube:
Cause: Scuffing against dock pilings, gunwales, or transport tie-downs during trailering.
Troubleshooting: Inspect the end cap area; replace if punctured to prevent sand, salt, and water from entering and corroding the inner throttle control mechanism.
OEM Part Numbers
Compatible OEM references include:
664-42119-00
664-42119-00
Compatible Engine Models
This Steering Tiller Throttle Handle Rubber Grip is primarily designed for:
2/4-Stroke 20/25/28/30HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Steering Tiller Throttle Handle Rubber Grip is commonly used for:
Outboard engine repair
Engine rebuilding projects
Marine maintenance workshops
Boat fleet maintenance
Commercial fishing vessels
Recreational boats
Marine spare parts distribution
