I have a 2002 Summit 700 And the recomended plugs for it are NGK BR9ECS. I went out to pick up a spare set for it today, and they are $10 a plug!!! My Uncle's 2003 Summit 800 Calls for the same spark plugs (BR9ECS) But it has BR9EYA Plugs in it, and seems to run perfectly. The BR9EYA's are only $4.25 per plug. We found that the "Y" in BR9EYA means a V groove plug, which they are. Does anyone know if it is fine to run these in my machine too? What about the BR9ES? What is the "C" IN BR9ECS? Any help would be great! Thank you.