I have 2 new to me db30's each has the 97cc stock motor. They are from different previous owners and each have a different spark plug. I've seen that most seem to recommend a ngk bpmr6a. Well napa near me doesn't have those and said the champion cross ref for those is a cj7y. Is that correct. I've seen comflicting on line info. Don't want opinions on brands just is that the right plug for them.
