From a press release issued by BCM – Project Monza:

BCM/Project Monza Ducati racer Bill St. John made an early exit from the last WERA Heavyweight Twins National of the season, crashing out of the lead in T-7. “We had put all the pieces together to give Batey a run yesterday. The Pirelli 16.5″ slicks and the step 2 BCM motor we got in on Friday were amazing. I came through seven and had an instantaneous snap highside. It felt like I hit oil. The first hint of everything not going to plan was when my head hit the track.”

St. John suffered a broken collarbone in the incident.