The answer to 'my repiping smells bad' is that a foul odor coming from newly installed plumbing pipes is often caused by improper installation or the use of substandard materials. This can lead to trapped air, sewer gas leaks, or bacterial growth in the pipes.
Some common causes include improper pipe sealing, using the wrong type of pipe, or failing to properly vent the plumbing system. Symptoms may include a rotten egg or sewage-like smell coming from sinks, showers, or other fixtures. If the smell persists, it's best to call a professional plumber to inspect the system and make any necessary repairs.