Small-engine spark plugs: finding the right plug for your mower, trimmer or generator
Find the right spark plug for your lawn mower, trimmer or generator. Match the number on the old plug or your manual, and learn when to change it.
Guides
When to replace spark plugs and signs they're worn
How often should you change spark plugs? Use your owner's manual interval, learn typical ranges by plug type, and spot the signs of worn spark plugs.
Copper vs. platinum vs. iridium spark plugs: which one do you need?
Copper, platinum or iridium? See how each spark plug type differs, how long they typically last, and why you shouldn't downgrade from iridium or platinum.
Champion spark plug numbers: the number vs. the code (71 = RC12YC)
Champion 71 and RC12YC are the same plug. Learn how Champion numbers and plug codes work, how to read the code, and how to use a cross reference safely.
NGK stock numbers vs. plug codes: how to find your NGK spark plug
NGK plugs have a plug code like BKR6E and a stock number like 6962. Learn the difference, how to read the code, and how to find the right NGK plug.