Posted by Steve@Advance on March 28, 2020 at 19:01:15 from (66.169.147.211):
In Reply to: 504 IH runs very rough posted by bigdieselman on March 28, 2020 at 16:33:56:
Was it running bad before the tune up?
After market ignition parts are known for being bad or wrong straight out of the box.
Carefully retrace all components of the ignition, especially the points and condenser, the distributor condition, and spark condition at each plug. Exhaust backfire is a sign of intermittent loss of spark, bad points,loose connection, bad ignition switch.
Do you have a vacuum gauge? Try checking the vacuum and look at the troubleshooting guide that comes with it.
I’m thinking that has a Siamese manifold, which can burn through between the intake and the exhaust. That will act like a bad vacuum leak.
The other thing that comes to mind is dry valve guides, causing slow valve closing, sticking at speed.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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