Nope Harley’s don’t have valve problems. Generally if you remove a muffler or remove the baffles in the exhaust the fuel system needs to be richened up. Most times, not 100% of the time, but most times when a motor is un-muffled it releases the backpressure on the exhaust system……..more air out, more air in. When you have more air going thru the manifolds the fuel mixture needs to be increased to correct the air to fuel ratio.
IF……a manifold is broken or an engine is run without exhaust manifolds, the valves will bend/warp from being hot and then cool down to rapidly.
If your tractor muffler was removed and it allowed cold air or snow or rain to get to those hot valves, it might cause them to warp.
On the other hand………. You could have a lean condition from releasing the exhaust backpressure, but more often then not, it will start eating pistons because the cylinder is to hot from lack of cool fuel and the piston will have a burned hole or it seizes in the cylinder. That usually occurs before it burns valves although a burnt valve is also a possibility.
A lot of the Harley owners remove the factory exhaust and run straight pipes or high performance exhaust systems. The carburetor will need to be adjusted richer. If it is EFI, the control module needs to be reprogrammed to send the increase in fuel to the injector(s).
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