Hi,<br /><br />Last fall I was working on a 1979 20hp Envinrude engine given to me.<br />I had backfiring problem thru the exhaust after having replaced the thermostat and head cover due to a blown "helicoil" resulting from the engine overheating. <br /><br />Here is what I did last fall:<br /><br />Checked for the correct spark plugs and/or cracked insulator. - Okay<br />Checked to ensure the spark plug wires were not crossed. - Okay<br />Checked for broken flywheel key - Okay<br /><br />Last weekend I was looking at it again after sitting all winter and while checking at the spark advance and ignition timing I discovered that there were 2 sets of timing marks on the flywheel. One for the electric start and the other for pull rope. Turns out that the timing was set at 34 degree TDC on the electric timing marks side. This engine is a pull rope. The TM for pull rope side is now almost at 0 TDC when the other side is at 34. There is a timig screw that allows me 1 degree per full clockwise turn but there is not enough screw lenght to do 34 turns.<br /><br />I understand that this engine is CD ignition and does not require timing adjustment. The problem is that it will not start just backfire through the exhaust.<br /><br />The question is how do I get the proper ignition timing marks to align at the pull rope TM side to 34 degree mark? <br /><br />Or is it that the plate is off and requires realignment.<br /><br />Thanks,<br /><br />Veronica
