Honda says development of the MSX125 resulted in four patent applications "focused around the split-structure tank cover and frame." To keep the package desirably small, components for the PGM fuel injection are housed inside the cover of the 1.45-gallon gas tank. Despite scooter-size 120/70-12 front and 130/70-12 rear rubber, this entry-level machine said to use "full-size motorcycle parts." Claimed curb weight is 224 pounds. Seat height is 30.1 inches, .4 shorter than a CBR250R.