hmmmm, could poss be your rings, just a thought though
my blaster quit like that once and it was the reed valve, might wanna check that too
400ex lrd full system, hotcam stage 2, big gun high rev ignition, k & n a/f, no air box, beadlocks, nerf bars, msr handlebars, tether switch, lonestar + 4 axle, front wheel spacers, a/c front bumper, dragon graphics kit, lonestar bearing carrier, 18 inch rear tires, smaller front sprocket, also have a 2003 rincon stock, 02 gsxr 750, 1995 yamaha blaster, 06 kxf450