The ignition module is underneath the blower housing recoil starter. Remove whatever you find necessary to get to the blower housing.
Air gap is 0.016 to 0.020 and mounting bolt torque is 80 - 100 lbin. Do NOT over tighten as threads in block easily strip.
See following for more detail.
https://www.mymowerparts.com/pdf/MTD-Service-Repair-Manuals/MTD-Big-Bore-Engines-78-277cc-83-357cc-90-420cc-Repair-Manual.pdf
SOURCE: how do I replace the
Heres a link to a video showing replacement of the most common primer bulbs on tecumseh small engines, keep in mind that there are a few different size of primer bulbs that look almost the same, so you would have to go by your engine model and go from there.
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