This comprehensive specification sheet provides detailed technical information on the Villiers MK 20 and 25 RG engines. The document offers a wealth of data, making it a valuable resource for anyone working with or restoring these engines. This detailed information would be a fantastic addition to any workshop or garage, serving as a valuable reference tool for mechanics and enthusiasts alike.

The Villiers MK 20 and MK 25 RG are a pair of petrol-powered, two-stroke internal combustion engines, renowned for their robust construction and widespread use in various applications. Manufactured by Villiers Engineering Company in Wolverhampton, England, these engines were particularly popular in the post-war era, finding their way into a variety of light machinery, including motorcycles, scooters, lawnmowers, pumps, and generators. The MK 20, boasting a 196 cc displacement, was a versatile workhorse, delivering a power output of 5 bhp. It featured a single-cylinder design with a bore and stroke of 63.5 mm and 63.5 mm respectively. The MK 25 RG, on the other hand, offered a larger displacement of 248 cc, resulting in a more potent power output of 7 bhp. This model shared the same bore and stroke dimensions as the MK 20, contributing to its overall durability and reliability.

Both engines incorporated a simple and effective design, featuring a cast iron crankcase, a reed valve induction system, and a magneto ignition system. They were renowned for their ease of maintenance, with readily available spare parts and straightforward servicing procedures. The MK 20 and MK 25 RG offered a range of optional extras, including electric starters, recoil starters, and different gearboxes, catering to the specific needs of various applications. These Villiers engines contributed significantly to the widespread adoption of small motorized machines, playing a pivotal role in the mechanization of various tasks, from everyday chores to demanding industrial applications. Their legacy continues to resonate today, as many of these engines remain in use, a testament to their enduring robustness and reliability.