Exhaust Soft Pop

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Posted by Max on October 15, 2018 at 20:41:34 [URL] [DELETE] :

Hello all, I have a question about my 1949 8N. It starts easily every time and runs good. However, when it idles or any time the engine is under no load there is a soft intermittent pop from the exhaust pipe. I would like to know if this is normal or not. The tractor is a front mount distributor and still has the 6 volt system. The entire tractor appears to be factory correct according to the documentation I have acquired from this web site. This is slightly long winded, but here is a brief history of my time with the tractor. When I brought it home last Spring I had to pull it behind my truck and pop the clutch to start it. The tractor had been sitting for several years without being used. I replaced the battery, battery cables, spark plugs, spark plug wires, starter solenoid, pulled the starter and cleaned the mating surface between it and the flywheel housing, replaced the points, condenser, coil, distributor cap, distributor and coil gaskets, set the points gap and timed the distributor as described in a 1948 8N Owner's Manual, verified continuity of the wire between the ignition ballast resistor and the coil primary, cleaned and rebuilt the Marvel / Schebler carburetor, adjusted the carb jets by a procedure I found on this site by Bruce (VA), cleaned the fuel screens in the gas tank and the carb, and verified I am getting gas to the carb. I purchased quality replacement parts from sources recommended on this site. Thanks to you all for sharing this knowledge. After doing all of this I still have the soft pop. If this is normal then I'll call it good. If not, I'd like opinions on what I have missed so I can correct the issue. Any advice is appreciated. Thank you all.


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