Having some issues with my wd-45. The tractor has not ran in over three years. Rebuilt the card, drained the old gas, new battery, cleaned the glass bowl, cleaned out the gas line, put new gas, changed the oil an filter, and she fired right up. Ran for about ten minutes and had a loud backfire and the tractor shut off. I found the gear on the bottom of the distributor had stripped out. Replaced the distributor and the housing for it. Set the #1 piston top dead center, turned to the left till point were about to open, set the plugs at 1243 per the firing order, tractor will not start. I have spark at points and at spark plugs, compression is good. Any suggestions?