i have a 1974 dt 360 It would just pop and sputer at first with any throttle but would idol, since then I have put a new piston,rings,adjusted comprssion release,rebuilt carb,new intake gasket, cleaned stainless reeds,new coil, new rectifier, set timiing 100% perfect,sanded and cleared ignition coil and drum,chased all wires for cracks and leaks,and coated the rusty tank with Kreem. And it still does the same *&%&^&*&^* thing I need help PLEASE anybody give me a idea