Aftermarket voltage regulator rectifier for Vespa GTS 250/300 — finned aluminum heat sink body with OEM-matched black and brown connector harness Aftermarket voltage regulator rectifier for Vespa GTS 250/300 — finned aluminum heat sink body with OEM-matched black and brown connector harness
Voltage regulator rectifier 641709-AFT — rear view showing finned heat sink and dual OEM connector plugs Voltage regulator rectifier 641709-AFT — rear view showing finned heat sink and dual OEM connector plugs
Aftermarket voltage regulator rectifier for Vespa GTS 250/300 — finned aluminum heat sink body with OEM-matched black and brown connector harness
Voltage regulator rectifier 641709-AFT — rear view showing finned heat sink and dual OEM connector plugs

RMS

Voltage Regulator - Vespa GTS 250/300

SKU 641709-AFT
$99.00
Shipping calculated at checkout.
Description

An aftermarket voltage regulator rectifier from for Vespa GTS 250/300, Piaggio BV/MP3/Beverly, and Aprilia Atlantic/SportCity models running Quasar 250–300cc engines. Converts AC output from the stator into stable 14.5V DC, protecting the battery and electrical system from overcharging spikes and undercharging dropouts. Features a die-cast aluminum finned heat sink for thermal management and includes OEM-matched connectors for a plug-in installation. Replaces OEM part numbers 641709, 639110, and 58115R.

  • Regulated 14.5V DC output — matches OEM voltage tolerance
  • Die-cast aluminum finned heat sink for heat dissipation
  • OEM-matched connector harness — plug-in installation, no splicing
  • Protects battery from overcharging and undercharging
  • Replaces OEM 641709, 639110, 58115R
  • SKU: 641709-AFT

Specifications

  • Output Voltage: 14.5V DC (regulated)
  • Type: Shunt-type voltage regulator rectifier
  • Housing: Die-cast aluminum heat sink with sealed epoxy potting
  • Replaces OEM: 641709, 639110, 58115R
  • SKU: 641709-AFT

Compatibility

Make Model Engine
Vespa GTS 250 / GTS 300 / GTS Super / GTV Quasar 250–300cc
Piaggio BV 250 / BV 300 Quasar 250–300cc
Piaggio MP3 250 / MP3 300 Quasar 250–300cc
Piaggio Beverly 300 / Beverly 350 Fuel-injected maxi-scooter
Aprilia Atlantic 250 Quasar 250cc
Aprilia SportCity 250 / SportCity 300 Quasar 250–300cc

 

Installation note: Ensure clean metal-to-metal contact at the chassis mounting point — the regulator body requires a solid chassis ground to dissipate excess voltage. Before replacing, verify the stator output and wiring harness are in good condition, as a faulty stator can damage a new regulator.

California Prop 65 Warning: www.p65warnings.ca.gov
Product Diagrams
Features
  • Regulated 14.5V DC output — matches OEM voltage tolerance
  • Die-cast aluminum finned heat sink for heat dissipation
  • OEM-matched connector harness — plug-in installation, no splicing
  • Protects battery from overcharging and undercharging
  • Replaces OEM 641709, 639110, 58115R
Specifications

Output: 14.5V DC regulated | Type: Shunt-type regulator rectifier | Housing: Die-cast aluminum heat sink, sealed epoxy potting | Replaces OEM: 641709, 639110, 58115R | SKU: 641709-AFT
Model Fitments

Vespa GTS 250/300/Super/GTV (Quasar), Piaggio BV 250/300, Piaggio MP3 250/300, Piaggio Beverly 300/350, Aprilia Atlantic 250, Aprilia SportCity 250/300
  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period on eligible items
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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