As of my last update in September 2021, the production motorcycle with the fastest standing quarter-mile time is Suzuki Hayabusa. It holds the official Guinness World Record with a time of 9.46 seconds at 248.8 km/h (154.6 mph). This record was achieved by a stock Suzuki Hayabusa (2019 model) on March 17, 2021, at the Famoso Dragstrip in California.
It's important to note that motorcycle performance and records can change over time, so there may have been newer developments since my knowledge cutoff. You may want to check official sources or motorcycle news outlets for the most up-to-date information on the fastest production motorcycles in terms of standing quarter-mile time.
