Piaggio 438073 Champion Spark Plug RG6YC – Vespa LX, Liberty, Beverly and Nexus 500

The Champion RG6YC spark plug with Piaggio code 438073 is the standard spark plug fitted to most of the Piaggio Group's 4-stroke range, from the 125 cc Vespa LX and Liberty to the 500 cc Beverly, Nexus and X9. It is a resistor type spark plug with a projected insulator nose, M10 x 1.0 thread, 19 mm reach, supplied in the original Piaggio Group packaging.

✓ Strengths

• It is the original equipment spark plug – the same code that Piaggio lists in its catalog, not an equivalent chosen for similarity.
• Original Piaggio Group packaging – the box is for genuine Piaggio, Vespa, Gilera, Aprilia, Derbi, and Scarabeo spare parts.
• Resistor type – the integrated resistance (6-15 kOhm) limits electromagnetic interference with the ECU and instrumentation.
• Projected insulator nose – promotes ignition and reduces fouling in urban use, characterized by frequent starts and stops.
• One code for dozens of models – the same spark plug covers Piaggio, Vespa, Gilera, and Aprilia from 50 to 500 cc 4-stroke.

Technical features

Vehicle compatibility

List taken from the official Piaggio spare parts catalog (B2B). There are over a hundred assignments: here they are grouped by family. If your model is not listed, send us your VIN number and we will check it.

To check along with the spark plug

When changing the spark plug, it's a good idea to check the rest of the ignition system and perform routine maintenance: spark plug cap and cable (if the cap is cracked or loose, the spark will be lost), air filter, and oil filter. By browsing our Piaggio spare parts, you can find the original codes for the same vehicle.

Who it's perfect for

It's the simplest and most cost-effective maintenance replacement there is: anyone who owns a Vespa LX, a Liberty, a Fly, or a Beverly and wants to get their ignition system in order will find the right spark plug here, with the manufacturer's code and not an equivalent chosen by eye. An engine that starts with difficulty when cold, idles irregularly, has hesitation during acceleration, or consumes more fuel than usual, often just needs this.

Frequently Asked Questions

Is this spark plug suitable for my Vespa LX 125?
Yes: the Champion RG6YC code 438073 is the spark plug indicated in the Piaggio catalog for the Vespa LX 125 4T, both 2V and the NOABS E2 and E3 versions from 2006 onwards, and it is the same for the LX 150, Vespa S, and LXV. If you have any doubts, send us your VIN number.

What is the difference between the RG6YC and the NGK CR8EB?
They are two equivalent spark plugs: same M10 x 1.0 thread, same 19 mm thread reach, same 16 mm hex size, and same resistor function. However, the RG6YC is the one Piaggio supplies as an original spare part with code 438073, and it is the one you will find in this package.

How many spark plugs do I need?
This listing is for one spark plug, which is enough for all the single-cylinder engines on the list — which is almost all of these scooters. If you are servicing multiple vehicles or want to keep a spare under the seat, order the quantity you need.

How do I know if the spark plug needs changing?
Typical signs include difficult cold starting, irregular idling, hesitation during acceleration, and higher fuel consumption. By removing it, you can also read the engine's condition: a black and wet electrode means a rich mixture, while a white and corroded one means a lean or too hot mixture.