Spark Exhaust Lambda Sensor Plug M18 Brass Universal TAPPO007
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The M18 plug. The larger of Spark's two thread sizes, and the one most modern motorcycles use.
Key Features
- M18 plug for closing an unused lambda sensor thread.
- Brass.
- Sealing washer ROND18X24R is a separate article.
- Spark part number TAPPO007, made in Mantova, Italy.
M18 Is the Common One
Most factory oxygen sensors use an M18 × 1.5 thread, which is why Spark's own weldable bung SGATT139 is cut to it. If you are closing a boss on a Spark system, this is the likelier of the two plugs.
When It Is Needed
On a racing system without a sensor, on a bike with the standard sensor relocated, or on a second-hand exhaust that arrived with an open boss. In each case the requirement is the same — a gas-tight hole rather than an open one.
Reducing Instead of Plugging
If the boss is M18 and the sensor is M12, Spark's SGATT260 adapter reduces one to the other for eight euro. That is a different problem from closing a hole, and a different article.
The Washer
ROND18X24R, one euro, copper. It also fits the SGATT260 reducer. Ordering the plug without it is the usual reason a plugged boss still ticks at idle.
| Part number | TAPPO007 |
|---|---|
| Type | Lambda plug |
| Material | Brass |
| Dimensions | M18 thread |
| Fitment | Universal |
| Road approval | None — track use only |
| Thread | M18 |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Plug M18 |
Universal product — Please check whether it fits your bike.
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// Spark Exhaust
Spark Exhaust Lambda Sensor Plug M18 Brass Universal TAPPO007

Tech specs
- Part number
- TAPPO007
- Type
- Lambda plug
- Material
- Brass
- Dimensions
- M18 thread
- Fitment
- Universal
- Road approval
- None — track use only
- Thread
- M18
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Plug M18
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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