NGK spark plugs are the BEST spark plugs for any application that requires a spark plug. And NGK makes a connector that will fit just about any engine you might have. If necessary, use the spark plug cross reference chart (easily found online) to find the correct NGK replacement plug for each OEM spark plug that came with your engine (e.g. Champion OEM spark plugs). I only used NGK spark plugs. For 10 years in all my low power appliances (lawn mower, washing machine, outboard motors, etc.). and I will not buy (or use) any other brands. They are totally reliable and 100% hassle-free. They also come with preset gaps (99.9% correct gaps in most cases). So you don't have to mess around with rechecking gaps before using them. Instead, just hit the engine and you're good to go. This online shop also does first-class business. Will give them an A+ rating on every aspect for service, price, free shipping and everything else.