FitMatch

The STIHL MS 250 takes the Bosch WSR6F spark plug as its spark plug; Australian sellers list it from A$4.00 as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.

Your chainsaw

Chainsaw

Confirmed against STIHL's list

Not yours? Change
WSR6F

Takes the WSR6F

Spark plug · check the code on your old part.

STIHL's MS 210/230/250 manual names Bosch WSR 6 F; gap 0.5 mm, replace after 100 hours. (STIHL Australia sells no service kit for the MS 250.)

Other STIHL models that take the WSR6F

Genuine

$4.00

Amazon AU · 28 Oct

Compatible

See seller

No compatible seller tracked yet

Genuine: made by Bosch. Compatible: another brand.

Lowest price · $4.00

Amazon AU. Every seller we track is listed below. Some links earn us a commission.

Open Amazon AU

Compare 4 listings from 3 sellers

AUD, before delivery. Each price shows when it was checked.

Amazon AUGenuine · checked 28 Oct$4.00Open
Power MowersGenuine · checked 3 Nov$4.60Open
Mower MerchGenuine · checked 28 Oct$7.20 each10-pack $72.00Open
Amazon AUGenuine · checked 28 Oct$7.30Open
Open cheapest seller · $4.00

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How long it lasts

Replace it after about 100 hours of use, or sooner if the electrodes are badly worn, STIHL's manuals say.

After replacing: No reset needed.

How to change the spark plug in your STIHL MS 250

Watch the guide or follow the steps.

Changing the spark plug of the MS 261 | STIHL​ · STIHL (official)
  1. 1Stop the engine and let it cool. On a chainsaw, engage the chain brake.
  2. 2Take off the shroud or spark plug cover, then pull the boot off the plug.
  3. 3Clean any dirt from around the plug so nothing falls into the engine, then unscrew it with the combination spanner.
  4. 4Check the gap on the new plug: STIHL gives 0.5 mm. Adjust it by bending the side electrode carefully if needed.
  5. 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:
Bosch WSR 6 F
Retail name:
Bosch WSR6F
Retail name:
WSR 6 F
Retail name:
WSR6F

Sellers list any of these; they are the same part.

About your MS 250

STIHL chainsaw — Petrol chainsaws (farm). Its spark plug is the WSR6F spark plug, part WSR6F.

Where the model number is: The model is on the rating plate on the saw's housing (STIHL MS 170, Husqvarna 135 Mark II, Ryobi OCS1830BL). The chain's code is stamped on the drive links or printed on its box, and the bar length is on the bar.

Fits these 19 STIHL models

MS 250. STIHL's MS 210/230/250 manual names Bosch WSR 6 F; gap 0.5 mm, replace after 100 hours. (STIHL Australia sells no service kit for the MS 250.)

MS 881. STIHL approves only the Bosch WSR 6 F (from STIHL) for the MS 881; gap 0.5 mm, replace after every 100 hours of runtime.

FS 55. Named with NGK BPMR 7 A in STIHL's 2023 FS 55 manual (0458-233-8321-G); gap 0.5 mm.

MS 362 C-M. Named in STIHL's 2017 MS 362 C-M manual (0458-154-8321-A) with NGK BPMR 7 A: use the plug your saw's manual names.

The other 15 models. STIHL's other approved plug for this model (with NGK BPMR 7 A); gap 0.5 mm.

Common questions
Which spark plug fits the STIHL MS 250?
The STIHL MS 250 takes the Bosch WSR6F spark plug. STIHL's MS 210/230/250 manual names Bosch WSR 6 F; gap 0.5 mm, replace after 100 hours. (STIHL Australia sells no service kit for the MS 250.).
Where can I buy the WSR6F in Australia?
We track 3 Australian sellers for the WSR6F; the lowest listed price when we last checked was A$4.00 at Amazon AU. Prices are re-checked daily and dated on this page.
How do I fit the WSR6F in a STIHL MS 250?
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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