Triumph Speed 400 spark plug

Spark plug for the Triumph Speed 400: when to replace it, what it costs, where to buy it and how to fit it.

Replace8,000-12,000 km (iridium up to ~20,000)

Typical priceUS$ 2 to 15

Difficulty1 of 5

Safety-criticalNo

Workshop photos

Spark plug with a light brown healthy tip

Plug temperature range for hot and cold plugs

Where to buy

Check the part number for your model year before you buy. Genuine (OEM) parts first; good aftermarket parts are fine for wear items. Links open shop searches; Moto Zero earns nothing from them today and will say so here if that changes.

Fit it yourself

Remove, check, gap and fit a spark plugRider job · 15 to 20 min Check for a spark safelyHome workshop · 10 to 15 min Diagnose exhaust smoke by colourHome workshop · 15 to 30 min (estimate)

See it working in 3D →How it works

Fitment

Model	Triumph Speed 400
Type	Retro
Engine	400 cc
Final drive	Chain
Brakes	Disc
Main markets	UK/IN

Questions

How often should I replace the spark plug on a Triumph Speed 400?

As a guide, 8,000-12,000 km (iridium up to ~20,000). The owner's manual for your model wins, and riding on dusty roads, with a passenger or with heavy loads shortens it.

How much does a Triumph Speed 400 spark plug cost?

Typically US$ 2 to 15, depending on genuine or aftermarket and the shop. Prices are indicative.

Can I replace the spark plug myself?

The job is rated 1 of 5 for difficulty. Follow the step-by-step guide and the values for your model.