Hi All, I'm needing to replace the spark plug on my son's 2001 XR70R. I was sent 3 plugs when I replaced his air filter but I don't think they are compatible with his bike. I can't locate much information on them so I thought I would ask the forum. The plugs are: NGK BPR9ES (has 7788 above the number) NGK DR9EA (has 3437 above the number) Thanks for your help! I'm working on getting his bike setup for the new race season starting this Saturday. My apologies if this seems like a remedial question but we are new to the sport.