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Im stumped. I went to start our JD and the darn thing wont start. It cranks over, backfires through the carb and now and then through the exhaust, has a week spark it seems, the spark plugs ar enot the ight ones but worked just fine even when carbon built up on them almost bridging both contacts. I had already cleaned the plugs a few weeks ago which made the tractor run much better.
It has a coil and not points. Plenty of fuel, or atleast I can smell it. Compression is just above 90PSI on both cylinders, one cylinder burns oil but was never a problem before.
Fuel filter is about... well. Im going to take a guess. probubly has been in there since 1984 :) So im going to do something about that but that wouldn't cause the engine to backfire through the carb.
Anyone got any ideas?
|ross||Sounds like a timing issue. Might want to check your flywheel key.
|Justin||I did some more testing on the spark issue and found it to be the plugs. For some reason, they worked for years and worked perfect a after I cleaned them the other week and all of a sudden they didn't produce spark.
Swaped them out with the right type and shortend the gap and tracker works fine.
|Justin||Thats what I thought at first, but I couldn't understand how it could be timing since I don't know to much about these tractors.
Just for future reference, where is the flywheel key? Do you mean the keyway to lock the flywheel onto the crank shaft?
|ross||There is a slot on the crankshaft and on the flywheel that is lined up with a key.