The STIHL FS 240 takes the NGK CMR6H spark plug as its spark plug; Australian sellers list it from A$8.80 as of 3 November 2026. Fitment confirmed against the manufacturer's compatibility list.
Your line trimmer
STIHL FS 240
Line trimmer
Confirmed against STIHL's listConfirmed against STIHL's own compatibility list
Not yours? ChangeTakes the CMR6H spark plug
CMR6H spark plug · check the code on your old part before ordering.
STIHL approves NGK CMR6H (from STIHL); gap 0.5 mm, replace every 100 hours of operation. (STIHL Australia sells no service kit for the FS 240.)
Your line trimmer
Line trimmer
Confirmed against STIHL's listConfirmed against STIHL's own compatibility list
Takes the CMR6H
Spark plug · check the code on your old part.
STIHL approves NGK CMR6H (from STIHL); gap 0.5 mm, replace every 100 hours of operation. (STIHL Australia sells no service kit for the FS 240.)
Other STIHL models that take the CMR6H
GenuineGenuine NGK
$8.80
Power Mowers · 3 NovLowest genuine · Power Mowers · checked 3 Nov
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by NGK. Compatible: another brand.Genuine is made by NGK. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $8.80
Power Mowers. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 3 sellers
AUD, before delivery. Each price shows when it was checked.
Genuine NGK
3 sellers
Opens Power Mowers in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it after about 100 hours of use, STIHL's manuals say.
After replacing: No reset needed.
How to change the spark plug in your STIHL FS 240
Watch the guide or follow the steps.
- 1Stop the engine and let it cool. On a chainsaw, engage the chain brake.
- 2Take off the shroud or spark plug cover, then pull the boot off the plug.
- 3Clean any dirt from around the plug so nothing falls into the engine, then unscrew it with the combination spanner.
- 4Check the gap on the new plug: STIHL gives 0.5 mm. Adjust it by bending the side electrode carefully if needed.
- 5Screw the new plug in by hand until it seats, tighten it with the spanner, press the boot firmly back on and refit any cover you took off.
Every number this part goes by
- Retail name:
- CMR 6 H
- Retail name:
- CMR 6H
- Retail name:
- CMR6H
- Retail name:
- NGK CMR 6 H
- Retail name:
- NGK CMR6H
Sellers list any of these; they are the same part.
About your STIHL FS 240
STIHL line trimmer — Petrol grass trimmers and brushcutters. Its spark plug is the CMR6H spark plug, part CMR6H.
Where the model number is: The model is on the rating label on the motor housing or the shaft (Ryobi OLT1832, Ozito PXCLTS-018). Take the battery out or switch off before you turn the head over; the old spool's own code is often moulded on it.
Fits these 26 STIHL models
STIHL26 models
FS 130. STIHL's FS 130 manual names NGK CMR 6H; gap 0.5 mm, replace after 100 operating hours.
FS 131. STIHL approves NGK CMR 6 H, STIHL ZK C 10 or Bosch USR 4AC; gap 0.5 mm, replace after about 100 hours.
FS 240. STIHL approves NGK CMR6H (from STIHL); gap 0.5 mm, replace every 100 hours of operation. (STIHL Australia sells no service kit for the FS 240.)
FS 460 C-EM. STIHL's FS 360/410/460/490 manual names NGK CMR6H or Bosch USR4AC for the FS 460 (no Australian price found for the Bosch plug); gap 0.5 mm.
FS 94. STIHL names NGK CMR 6 H; gap 0.5 mm, replace after about 100 hours. (STIHL Australia sells no service kit for the FS 94.)
HT 133. STIHL names NGK CMR 6 H for the HT 132 and HT 133; gap 0.5 mm, replace after every 100 operating hours.
HT 135. STIHL approves NGK CMR 6 H or Bosch USR 4AC for the HT 134 and HT 135; gap 0.5 mm, replace after about 100 hours.
HT 56 C-E. STIHL names NGK CMR 6 H; gap 0.5 mm.
MS 194 T. STIHL approves NGK CMR6H; gap 0.5 mm, replace after every 100 hours of runtime. (STIHL Australia sells no service kit for the MS 194 T.)
MS 241 C-M. STIHL approves NGK CMR6H or Bosch USR4AC (no Australian price found for the Bosch plug); gap 0.5 mm.
MS 362 C-M. STIHL's current MS 362 C-M manual (0458-154-8321-C) approves NGK CMR 6 H or Bosch USR 4AC; gap 0.5 mm.
MS 400 C-M, MS 462 C-M. STIHL approves NGK CMR6H; gap 0.5 mm, replace after about 100 hours.
FS 261 C-E, FS 361 C-EM, FS 461 C-EM L. STIHL approves NGK CMR6H (from STIHL); gap 0.5 mm, replace every 100 hours of operation.
MS 162, MS 172, MS 182, MS 212. STIHL approves NGK CMR6H (or STIHL's own ZK C 10); gap 0.5 mm, replace after every 100 hours of runtime.
The other 6 models. STIHL approves NGK CMR6H or Bosch USR 4AC (no Australian price found for the Bosch plug); gap 0.5 mm, replace after about 100 hours.
Common questions
- Which spark plug fits the STIHL FS 240?
- The STIHL FS 240 takes the NGK CMR6H spark plug. STIHL approves NGK CMR6H (from STIHL); gap 0.5 mm, replace every 100 hours of operation. (STIHL Australia sells no service kit for the FS 240.).
- Where can I buy the CMR6H in Australia?
- We track 3 Australian sellers for the CMR6H; the lowest listed price when we last checked was A$8.80 at Power Mowers. Prices are re-checked daily and dated on this page.
- How do I fit the CMR6H in a STIHL FS 240?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A worn or fouled plug makes the saw hard to start and run unevenly.
- Is there anything to reset afterwards?
- No reset needed.
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