Spark plugs are a key part of maintaining a petrol power tool, especially STIHL chainsaws, and you may think that one spark plug is much the same as another. A standard NGK spark plug and NGK spark plugs sold by STIHL may have the same part number stamped on them, but the STIHL NGK spark plug has some key differences.
The main differences between the STIHL NGK spark plug (right) and the off the shelf NGK plug (left) are:
- The union nut (1) of a STIHL spark plug is fixed in place. This ensures there is no spark gap which could impair performance or potentially ignite gasoline fumes.
- Interference suppression resistance (2) is tuned to STIHL machines for the optimal spark and efficiency. This protects the machine’s ignition module from early failure.
- STIHL spark plug sealing ring (3) is coated for a better contact and corrosion resistance, given that these tools are used in challenging and often wet environments.
- The electrode gap (4) is aligned to STIHL products for optimal compression.
For the best performance from your STIHL tool, we recommend that you always use the STIHL NGK spark plug.
The spark plugs are listed in the “Technical data” chapter of your machine’s Instruction Manual. For more information and to order your genuine STIHL spark plug, contact your local Approved STIHL dealer.
I need 2 R10 Spark plugs (1spare) for my long reach hedge trimmer
Hi John, thanks for your comment. We don’t sell any spare parts directly, so we recommend that you speak to your local STIHL Approved Dealer to order the part. You can find your nearest one here: https://shop.stihl.co.uk/pages/dealer-locator
Thanks, STIHL GB
NGK makes plugs with the same part number that are different? I am skeptical.
Hi, thank you for your comment. We understand how there could be some confusion, which is precisely why we wanted to write this blog post, with clear pictures showing and explaining the differences. Thanks, STIHL GB
Ok guy’s you have outlined the differences and you say both companies use the same part number.
So when I’m handed a Stihl NGK spark plug in the shop will it say Stihl on the box and is the plug it’s self stamped with the Stihl logo?
Hi, thanks for your comment. Once they are out of the box, there isn’t anything to obviously identify it so the best option is to make sure you ask for an official STIHL spark plug from a STIHL Approved Dealer. Thanks, STIHL GB