The next new model, the M20K 252, appeared in early 1986 with a top speed of . It replaced the 231 and achieved its higher speed with the same engine. It featured a new 28-volt electrical system to power additional equipment and to improve cold-weather starting. The Continental TSI0-360-GB engine in the 231 had required specific pilot training and modified takeoff and climb procedures to operate at acceptable engine temperatures in hot weather. Because of this, the 252 received an intercooled TSIO-360-MB engine. The various improvements were copied to the 201 airframe, and the new 205 model was released in 1987.