400ltd back from the dead

New to the forum. I'm helping my neighbor get his '79 KZ400LTD back from the dead. It has been dead for over a year. He said his lights got really bright just before everything died on him and he couldn't get it started again. I found it had no spark and replaced the coil, plugs, plug caps, points, and condenser. I gapped the points and set the timing per the clymer manual. I also replaced the regulator/rectifier because I suspect that caused the bright lights thing and blew his ignition circuit.

Now it has good spark but it still won't start. I pulled the carbs and cleaned them and blew them out. They're back on and still no luck starting. Checked compression and found both cylinders at ~150. With full choke I get a little bit of rumble like it wants to start but never get it to catch.

At this point I'm stuck and thinking about revisiting the carbs. Any ideas on what I might be missing?

Bump. Anybody have any ideas?

Set your petcock on prime.
If that doesn't work you didn't clean your carbs well enough.


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Starter fluid and if bike has electric start then jump it from a car - NOT RUNNING - battery