Briggs & Stratton Spark Plugs
Our Briggs & Stratton spark plugs deliver reliable ignition for lawn mower engines and small engine equipment. Engine spark plugs create the electrical arc that ignites the fuel-air mixture, making them critical for starting and smooth operation. We stock genuine Briggs & Stratton engine spark plugs including popular models like RC12YC, RJ19LM, and 491055S, plus premium alternatives from Champion and NGK. Correct small engine spark plug selection ensures optimal performance, whilst proper gap settings prevent hard starting and misfiring. We hold worldwide stock of lawn mower spark plugs for Classic, Sprint, Intek, and Vanguard series engines, and sell globally with fast despatch.
Available Briggs & Stratton Spark Plugs
Boot Spark Plug
691909
Briggs & Stratton
£5.15
In Stock
Spark Plug
692051
Briggs & Stratton
£4.55
In Stock
Spark Plug
797434
Briggs & Stratton
£5.60
In Stock
Spark Plug
691043
Briggs & Stratton
£5.50
In Stock
Spark Plug Terminal
493880S
Briggs & Stratton
£3.45
In Stock
Spark Plug Terminal
692424
Briggs & Stratton
£4.95
In Stock
Spark Plug
798615
Briggs & Stratton
£4.50
In Stock
Boot Spark Plug
798619
Briggs & Stratton
£5.55
In Stock
Spark Plug
792015
Briggs & Stratton
£5.50
In Stock
Spark Plug Ems
692720
Briggs & Stratton
£5.25
In Stock
Spark Plug Wrench
89838S
Briggs & Stratton
£4.89
In Stock
Spark Plug Boot
66538S
Briggs & Stratton
£3.50
In Stock
Frequently Asked Questions
What are the signs that my spark plug needs replacing?
Hard starting, requiring multiple pulls on the rewind, indicates spark plug problems. Other symptoms include rough idling, engine misfiring, black smoke, excessive fuel consumption, and poor performance. Visually inspect the plug for cracked porcelain, heavily burned or melted electrodes, or stubborn carbon deposits that won't clean off. Light deposits can be cleaned with a wire brush, but replace plugs showing cracks, severe corrosion, or worn electrodes.
Why is spark plug gap important and what happens if it's wrong?
The gap between electrodes must be precise—typically 0.030 inches for most Briggs & Stratton engines. Too narrow produces a weak spark that won't properly ignite fuel, causing poor combustion. Too wide prevents the spark jumping the gap, resulting in misfires, hard starting, and rough running at high speeds. Always check your engine manual for the correct gap specification and use a feeler gauge to verify before installation.
How frequently should I replace my lawn mower spark plug?
Replace spark plugs annually or every 50-100 hours of operation, whichever comes first. Most homeowners benefit from annual replacement at the start of mowing season. Commercial users may need more frequent changes depending on hours logged. Even if the plug appears functional, annual replacement prevents problems and ensures reliable starting. Spark plugs are inexpensive insurance against hard starting and poor performance.
Can I clean and reuse spark plugs or must they be replaced?
Light carbon deposits can be cleaned using a wire brush and spray-on plug cleaner. After cleaning, check the gap and reinstall if electrodes aren't worn. However, plugs with heavy deposits, cracked porcelain, burned electrodes, or significant wear should be replaced rather than cleaned. Cleaning extends plug life temporarily, but replacement guarantees optimal performance. Given the low cost, replacement is often more practical than cleaning.
How do I know which spark plug fits my Briggs & Stratton engine?
Check your engine model number and consult the operator's manual for the correct spark plug part number. Using the wrong plug—even if it physically fits—causes performance problems and potential engine damage. Common Briggs models use RC12YC, RJ19LM, or 491055S plugs, but specifications vary by engine series. Cross-reference Champion, NGK, or other brands carefully, ensuring heat range and thread specifications match exactly.