Here's why I ask and I apologize for the long story: we get the kids a Kitty Cat for for X Mas. She's looking purty under the tree on the 25th AM. My 7 year old takes a few spins around the house, loves it, and we let the 5 year old have at it. 2 laps around the yard (neighbors gotta love us
) and boom! she smacks the kitty into the minivan. We're done by noon. Everyone's ok except the hood on the kitty pushed in and busted off the spark plug. I go to replace it and find about 6 different options listed between NGK, Champ, and Autolite. To top off the confusion, the previous owner had used a NOT-listed NGK BR9something. I end up with the last of all 6 choices and the engine now starts really really hard, but runs fine once you get 'er goin.