I gently laid my '82 goldwing down on it's left side for about 5 minutes. Now the new starter engages and gear and chain seem to be tracking OK, but the engine will not turn over. Started great before this mishap.
Concur, if the tank was full and the petcock open there's a good chance the downside carbs leaked into the lower cylinders. You might also check that your oil level is normal, if it's a bit high it's probably gasoline diluted. Best bet in that case is to replace the filter and oil.