No start. Have installed new coil (tried 2 different new coils), new plug, cleaned engine ground, disconnected switch. Occasional visual spark with plug grounded on engine. In-line spark tester does light dimly. Sanded magnet contacts which are rust free. Checked spark arrestor which is clear. Also has new carburetor, gas lines, primer bulb (carb kit). Any other ideas would be appreciated. Thank you.