Hi there i just picked up a rb mods 821b from another member that is still being broken in. I just ran 11 tanks through it on friday, and it had 11 tanks on it when I got it. As far as the ball dropping, wow, I had it tuned to run decent while still being rich (around 200) and it was starting to come alive. Next tank it was so rich I wouldn't even really run halfway through the tank. It took alot of leaning to get it back to where I was the tank before. It seems to be on it's way. I am curious as to what plugs work on nova besides novas. Rick recommended a hot plug on his engine, but that is all he told me. I am getting some last minute parts ordered for the first oregon pro series in medford and was needing some plugs. What do you recommend?