250SX DEMO+ $695 FRT & PDI $195 DOC Unrivaled 2-stroke Performance With enough power to excel on all sorts of tracks and terrain, combined with an extremely lightweight chassis, the 250 SX has 1 of the best power-to-weight ratios in motocross. The unrivaled performance of the lightweight 2-stroke engine makes it a true contender against the more complex 4-strokes. For model year 2016 the 250 SX features detail improvements and new colors and graphics, but basically retains the same chassis and engine specification as model year 2015.