GAS GAS MJ rear sprocket for Gas Gas SM 400 FSE 2003-2004 MJ Corse MJ.752 €43.13 High quality duraluminium (ergal) rear sprocket for Gas Gas SM 400 FSE 2003-2004, with chain pitch 520 and with number of teeth from 42 to 56. Select the chain pitch and number of teeth you need by clicking below. Add to cart