Yes, I am familiar with that incredible story! It speaks to Kenny Roberts' incredible resourcefulness, ingenuity, and determination. The race in question was the 1978 Venezuelan Grand Prix, and Roberts was racing for the Yamaha factory team. Heavy rain made conditions treacherous, and with no rain tires available, Roberts had to improvise. He and his team used a tire iron and a razor blade to cut grooves into standard racing slicks, creating makeshift rain tires. Despite starting from the back of the grid due to having to pit for new tires, Roberts charged through the field to win the race. It's an amazing feat of skill, courage, and quick thinking that is still talked about today as one of the greatest performances in the history of motorcycle racing.