Ignition Coil - Vespa GTS 250/300

RMS Ignition Coil – Vespa GTS 250/300

A weak or failing ignition coil is one of the most misdiagnosed problems on fuel-injected Vespas. If your GTS is misfiring at idle, stumbling under load, or refusing to start despite a good battery and fresh spark plug, the coil is the first place to look. This high-quality RMS aftermarket replacement restores full high-voltage spark output to your ignition system, ensuring clean, complete combustion across the entire RPM range.

Key Features

• Full Spark Output: Engineered to deliver the correct high-voltage pulse to the spark plug cap, restoring crisp throttle response and eliminating misfires.

• OEM-Spec Winding: Internal primary and secondary coil windings matched to Piaggio's original resistance specifications for a true drop-in replacement.

• Heat-Resistant Epoxy Potting: Coil internals are sealed in high-temperature epoxy to protect against vibration, moisture ingress, and thermal cycling.

• Direct Connector Match: Factory-matched electrical connector plugs directly into the GTS ignition harness — no splicing, adapters, or modifications required.

Fitment Guide

Technical Specs

• Part Number: 58120R-AFT

• Replaces OEM: Piaggio / Vespa ignition coil for Quasar 250–300cc engines

• Voltage: 12V DC input

• Output: High-voltage secondary winding (standard CDI/TCI compatible)

• Connector: Factory-matched multi-pin plug

• Manufacturer: RMS (Italy)

Maintenance Note: Before condemning the coil, always check the spark plug cap resistance (should be ~5kO) and the plug itself. A carbon-tracked or fouled plug can mimic a dead coil by bleeding off the high-voltage pulse before it fires.

Installation Tip: The ignition coil on the GTS is tucked behind the left side body panel near the airbox. Remove the panel carefully and disconnect the coil's two-pin connector and the plug cap before unbolting the coil bracket — it's a 10-minute job with the right trim tools.

Pro Tip: When reinstalling, apply a small amount of dielectric grease inside the spark plug cap before pressing it onto the plug. This prevents moisture from wicking into the cap and causing intermittent misfires on damp mornings.

WARNING: California Proposition 65