I like NGK spark plugs, the have always treated me well for a reasonable price. It's the Honda suggested spark plug for my '06 crf450r. Don't yank on the spark plug boot too hard. It's a spark plug, my old one was fouled due to a rich condition.
Designed specifically for the dirt bike or ATV performance enthusiast. Iridium IX® offers extreme ignitability, improved throttle response and superior anti-fouling.
Note: Please verify spark plug number before purchasing. Spark plugs are NOT returnable.