Per your diagnosis, you still have a bad ignition control unit.
Is your carb linkage hooked up correct? Are you mowing with the choke on? Is the carb pilot jet set proper? You put a new China carb on it. Is the idle set to 1750rpm and max revs like 3200? Once the engine is running, can you make the choke come on and audibly HEAR the engine stumble? If you can that means the choke is working. Valve clearance set to OEM specs? You said you have good fuel flow to the carb. Was that China carb proper for YOUR engine? Is the engine block breather tube clear and connected to the carb inlet? Flywheel key in proper shape? Fuel valve ON? If you have it off, it will still run for a few seconds and sputter then die. On the top engine cover, you should see a fuel can and a fuel can with a line through it. Fuel valve is between those. Make sure you turn the valve towards the fuel can only. Ignition kill lever on handlebar set proper?
On this engine you can tell when it tries to start up. It will make a grunting sound like it's trying to fire off.
slomo
Is your carb linkage hooked up correct? Are you mowing with the choke on? Is the carb pilot jet set proper? You put a new China carb on it. Is the idle set to 1750rpm and max revs like 3200? Once the engine is running, can you make the choke come on and audibly HEAR the engine stumble? If you can that means the choke is working. Valve clearance set to OEM specs? You said you have good fuel flow to the carb. Was that China carb proper for YOUR engine? Is the engine block breather tube clear and connected to the carb inlet? Flywheel key in proper shape? Fuel valve ON? If you have it off, it will still run for a few seconds and sputter then die. On the top engine cover, you should see a fuel can and a fuel can with a line through it. Fuel valve is between those. Make sure you turn the valve towards the fuel can only. Ignition kill lever on handlebar set proper?
On this engine you can tell when it tries to start up. It will make a grunting sound like it's trying to fire off.
slomo