GS500 1993 Starting troubles

[notelrat]

I have a 1993 GS500, has sat for over a year. It was seized. It will not start, I have got it to fire up and run for about 20-30 seconds tops and than it will just die like it stopped getting fuel.  It could be a combination of problems, I dont think its flooding, but after turning it over a few times and not starting the plugs are always wet.  Last time I started it it started with no choke (which seems not that common for GS500s especially one that isnt running).

Things I have done:

Replaced Spark Plugs
Checked/cleaned fuel petcock
Replaced fuel lines from tank to petcock and blown out other lines
Cleaned carburetors (twice)
Removed Exhaust and tried to blow out any mouse particles
Removed the mouse nest from the air filter

Symptoms:

Low compression in left cylinder, under 100psi.  When running, right cylinder was not firing as well as the left even though it has better compression (this was a problem a year ago before it sat).  To test, switched ignition coils.  Right cylinder seemed to than fire better than left which it should as it has better compression (140psi) but have only got to test it once, has not started again since.  Starts very inconsistently.    So possibly one bad ignition coil.  Bike was seized, not sure but seems that complications with that should still allow the bike to at least start. I will remove plugs, put gas in, replace plugs and it will start, run, die after 10-30 seconds.  Than it will refuse to start again, often until another day I try to work on it.  Right now I have broken it down again with the carbs apart, which look clean.  Adjusting float height because it was off,  thought it may be causing flooding but do not think that is the source of my problem.

Not sure what is going on, has fuel, spark and I think enough compression that it should start.