I picked up a 1233. The engine is a Tecumseh OHSK120 223618A with electronic ignition. There was no spark. The prior owner said he had a trouble with spark and replaced the ignition module. I tested for spark and there was no spark. The engine has oodles of compression so I figured I'd just put in a new module so ordered one.
After putting in the new module and setting the air gap to .012 I there is still no spark. I disconnected the lead from the module per the Tecumseh manual in case of shorts but still no spark.
On poking around the net descriptions of how modules trigger there is a mention the module passes a coil, an internal cap gets charged, the module continues past a trigger coil which switches a transistor to let the cap dischrge into the plug wire. The magnets were a bit rusted so I filed them a little thinking the gap may be off or some of the rust spots too high. They are pretty clean and the gap even.
I don't know if one of the two flywheel magnets is the trigger magnet or if some part is missing. The flywheel has two part magnet and it does seem to have good strenth when pulling in a screwdriver. The gap is set. What else could be wrong other than a defective module?
david
