Piaggio 642671 Engine Stop Run/Off Switch – Beverly 300 ie ABS E4 and Fly 125

The Piaggio 642671 engine stop switch is the red RUN / OFF switch on the right-hand control block, which shuts off the engine without needing to turn the key. The official Piaggio parts catalog lists it under the Electrical System group, plate 06.01 «Switches - Commutators - Buttons» with the official name «Engine stop switch». This is a new, original Piaggio spare part, available in two pieces.

✓ Key features

• Original Piaggio spare part – this is the same switch installed at the factory, OEM code 642671
• The cheapest on the market – the same code, new and original, costs between 12 and 23 euros on the market, shipping included
• Compatibility verified on the official plate – not just an assumption: the reference appears on plate 06.01 for both the Beverly 300 ie ABS E4 and the Fly 125 4T/3V ie
• Original RUN / OFF silkscreen – red rocker on a black frame, with the crossed-out spark plug symbol in the OFF position: exactly what your scooter had when new (verified from product photos)
• Easy to replace – it is a plug-in module with a dedicated connector: simply remove the control block housing, slide out the old one, and insert this one (verified from product photos)
• A fault that stops your bike – when the internal contact oxidizes, the scooter won't start or turns off while riding: it may seem like a serious problem, but it is a ten-euro fix

Technical specifications

Vehicle compatibility

Compatibility based on official Piaggio data, found in the original parts catalog: reference 642671 appears as «Engine stop switch» in catalog NCPN000U07 Beverly 300 ie ABS E4 2016-2020 (EMEA), Electrical System group, plate 06.01, position 5 (VIN prefix ZAPMA2100, engine MA21M), and in catalog NSEM000U01 Fly 125 4T/3V ie E3 LEM 2012-2013 (EMEA), same plate 06.01, position 8 (VIN prefix RP8M79100, engine M791M).

Who it is perfect for

It is the classic fault that seems massive but costs ten euros. The engine stop switch is in series with the ignition circuit: when internal contacts oxidize — which happens on scooters parked outdoors — the engine may no longer start, or it might start and turn off by itself while you're riding. At that point, many people suspect the ECU or the coil, take the vehicle to a shop, and pay for a diagnostic fee. If your Beverly 300 or Fly 125 has this symptom, this is the first part to try: it is original, takes ten minutes to change by opening the control block, and it either solves the issue or rules out the most common cause for a very low cost.

Frequently asked questions

Which scooters does the 642671 fit?
It fits the Piaggio Beverly 300 ie ABS E4 2016-2020 (EMEA) and 2019 (APAC), and the Piaggio Fly 125 4T/3V ie E3 LEM 2012-2013 (EMEA). This is the official data from plate 06.01 of the Piaggio parts catalog. If you have a different version, write to us with your VIN: we will verify it before you order.

What does the RUN / OFF switch do?
It is the engine stop switch, the red button on the right control block. In the RUN position, it closes the ignition circuit and the engine can run; in the OFF position, it interrupts the circuit and the engine shuts off immediately, without needing to turn the key. It is a safety device required by homologation.

How do I know if this is the cause of the fault?
Typical symptoms are the engine failing to start despite the battery and dashboard being on, or sudden engine cut-outs while riding, often triggered by moving the button or during humid weather. Verification is simple: with a multimeter on continuity mode, in the RUN position, the contact must be closed and in OFF it must be open. If the contact is intermittent or always open, the switch needs replacing.

Is it difficult to replace?
No. Remove the screws from the right-hand control block housing, disconnect the connector, slide out the old switch, and insert this one. Ten minutes with a screwdriver. The only precaution is not to force the plastic clips on the housing, which can become brittle over the years.

Is the wiring included?
No. The package contains the switch only: wiring, housing, and screws are reused. If your connector is oxidized, clean it with contact cleaner before reassembling — often half the problem is there.