Piaggio 438071 Champion P86M Short Thread Spark Plug – Vespa PX 125/150, 50 Special, Ciao, Si

The Champion P86M spark plug is the short-reach spark plug supplied by Piaggio with the code 438071: it is the original spare part for classic two-stroke engines from the Pontedera manufacturer, from the Vespa PX 125 and 150 to the Vespa 50 Special, up to the Ciao, Si, Bravo, Boxer mopeds and the PK 50 and 90. It is equivalent to the NGK B6HS and the Champion L86C. It is supplied in Piaggio Genuine Spare Parts packaging.

✓ Strengths

• Original spare part in Piaggio packaging – code 438071, not a generic spark plug picked off the shelf
• Standard heat range – the same as specified by the manufacturer: no risk of pre-ignition or fouling
• Short thread reach – the correct thread length for classic Piaggio two-strokes
• Known equivalences – NGK B6HS and Champion L86C: if your manual lists one of these codes, this is the right spark plug
• Service component – it's worth keeping a spare in the glove compartment, it's cheap and prevents you from being stranded

Technical features

Vehicle compatibility

Code 438071 does not appear in the Piaggio B2B with the vehicle list, and the online catalog does not publish its assignment table. The compatibility above is reconstructed by cross-referencing the catalogs of multiple specialized retailers (Motocenter, La Vespa Due, Centro Ricambi Amato, Biolla Motors, and professional dealer listings). If your model is not listed, contact us and we will verify it together.

Who it's perfect for

This is the spark plug for those who keep a Vespa or a Ciao on the road and want to put the right part back in instead of improvising with what the hardware store has. It is needed when the engine starts with difficulty when cold, idles poorly, misfires uphill, or the removed spark plug appears black and wet. It costs a few euros and is the first spare part to try when the ignition is acting up: many buy them in pairs to always have a spare under the seat.

Frequently Asked Questions

What is the equivalent of the Champion P86M?
The Champion P86M corresponds to the Champion L86C and the NGK B6HS: they are the same standard short-reach spark plug with the same heat range. If you find one of these three references in your vehicle's manual or on the spark plug you remove, Piaggio code 438071 is the correct replacement.

Which vehicles does it fit?
On classic Piaggio two-strokes: Vespa PX and PE 125 and 150, Vespa 50 in Special, R, L, N, and S versions, Vespa PK 50 and 90, and the mopeds Ciao, Si, Bravo, Boxer, Boss, and Grillo. For larger displacements, including PX 200, check the thread reach before ordering.

How many spark plugs does the package contain?
One: the price shown is per single piece, in the original Piaggio Genuine Spare Parts box you see in the photos. If you need more spark plugs, just increase the quantity in the cart.

How often should the spark plug be changed?
On a two-stroke engine, the spark plug is a consumable component: it should be checked at every service and replaced when the electrode is rounded, the insulator is black and oily, or starting is difficult when cold. On a vehicle used daily, it should be replaced at least once a year.