All the clutch covers we can get for your GAS GAS ECF 250, 300, 450 4-stroke motocross bike are available at CROSS-MANIA.COM.. We offer a wide range of original and competition brands such as PROX, HINSON,... All in stock and quickly available. Don't neglect your clutch housing. If it starts to play up, it's time to change it. At best, this can just cause premature wear of your clutch. At worst, your entire primary transmission and gearbox will have to be replaced. As a reminder, the clutch housing is used to transfer power from the crankshaft to the gearwheel. It's an important part of your engine.