Triumph's headquarters and main manufacturing facility are located in Hinckley, where they produce a significant portion of their motorcycles, including their engines. The Hinckley factory is known for its state-of-the-art facilities and advanced manufacturing processes.
In addition to the UK, Triumph has a manufacturing plant in Chonburi, Thailand. This facility was established in 2002 and is the company's main production hub for motorcycles destined for the Asian market. The Chonburi facility also manufactures engines, allowing Triumph to cater to the growing demand in the region while maintaining high-quality standards.
It's worth noting that manufacturing processes and locations may evolve over time, so I recommend checking with official Triumph sources or their website for the most up-to-date information on engine production.