RMS
Description
This RMS starter button switch restores a crisp, responsive start-button feel to compatible Vespa and Piaggio scooters, helping you get back to enjoying the ride instead of fighting a sticky or worn switch. The black button carries a white starter symbol and fits into the handlebar housing with a molded retaining clip and connector base. It is a direct replacement for a matching original switch with reference number 638975 or 582989.
Key Features
- Responsive starting control: Replaces a sticking or worn starter button when the switch is the source of intermittent starting.
- Direct-fit installation: Matches the original switch dimensions and fits the matching handlebar housing without cutting or filing.
- Factory-harness connection: Multipin connector block connects to the matching original wiring harness.
- Weather-resistant construction: UV-stabilized ABS housing resists fading and cracking from exposure.
- Easy identification: White starter symbol stands out against the black button.
Technical Specifications
- Brand: RMS
- Part number: 638975-AFT
- Replacement references: 638975, 582989
- Component: Handlebar starter button switch assembly
- Classification: Aftermarket replacement
- Housing material: UV-stabilized ABS plastic
- Internal spring: High-rebound spring
- Connector: Multipin plug block for the matching factory harness
- Color: Black with white starter symbol
- Mounting: Clip-in handlebar housing fitment
- Quantity: One switch
- Country of origin: Italy
Compatibility
| Make | Models | Applications |
|---|---|---|
| Vespa | GTS 250 / 300, GTS Super, GTV | 250cc and 300cc variants, including HPE |
| Vespa | LX 50 / 150 | All model years and engine configurations |
| Vespa | LXV 125 / 150 | All model years |
| Vespa | S 50 / 125 / 150 | All model years |
| Piaggio | Liberty 50 / 150 | Modern four-stroke and iGet variants |
| Piaggio | Fly 50 / 150 | Two-stroke and four-stroke generations |
Match the original switch reference, housing shape and connector configuration before ordering. Similar-looking buttons can serve different functions; confirm the correct part reference before using this switch for a horn or seat-release application.
Installation tip: Disconnect the battery before working on the switch. Use a plastic trim tool or protect your removal tool to avoid scratching the painted handlebar housing. If starting remains intermittent, check the battery, wiring and starter circuit as well.
Product Diagrams
Features
Specifications
Brand: RMS; Part number: 638975-AFT; Replacement references: 638975, 582989; Type: handlebar starter button switch; Classification: aftermarket; Housing: UV-stabilized ABS plastic; Spring: high-rebound; Connector: multipin plug block; Mounting: clip-in; Color: black with white starter symbol; Quantity: 1; Origin: Italy
Model Fitments
Vespa GTS 250/300, GTS Super and GTV 250/300 including HPE; Vespa LX 50/150 all model years and engine configurations; Vespa LXV 125/150 all model years; Vespa S 50/125/150 all model years; Piaggio Liberty 50/150 modern four-stroke and iGet variants; Piaggio Fly 50/150 two-stroke and four-stroke generations; Match original references 638975/582989, housing and connector configuration
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
