Thanks for your detailed response. I still think it's more than a coincidence that both carbs that are further away and have more distance for the fuel to travel are showing lower levels and both outside carbs with less distance for the fuel to travel are showing higher levels, but I've been wrong before and will be again :\
I'm wandering about how unburnt fuel would get into the oil? Presumably the mixture would have to be roughly correct and the bike firing on all cylinders or it wouldn't run properly. The only way I can think that this would happen is if one or more valves aren't seating properly allowing the fuel / air mixture to be forced into the engine on the compression stroke !?! I know your line of reasoning is that the floats are letting in too much fuel and dumping it but I can't see that the float bowl overflow would be routed to dump fuel internally rather than externally, that doesn't make sense. Unless of course the same hose gremlin that fitted your redundant coolant circuit hoses for no possible reason routed the overflow hoses incorrectly to an engine breather connection !?!
I take it you've checked the coolant levels to make sure it's not a problem with coolant getting into the engine? But if the bike has been running and the oil level has risen significantly you'd definitely notice the oil emulsifying and probably mayonnaise around the filler cap if coolant was involved.
As Cl1ve2004 says this is an interesting thread.
I'm wandering about how unburnt fuel would get into the oil? Presumably the mixture would have to be roughly correct and the bike firing on all cylinders or it wouldn't run properly. The only way I can think that this would happen is if one or more valves aren't seating properly allowing the fuel / air mixture to be forced into the engine on the compression stroke !?! I know your line of reasoning is that the floats are letting in too much fuel and dumping it but I can't see that the float bowl overflow would be routed to dump fuel internally rather than externally, that doesn't make sense. Unless of course the same hose gremlin that fitted your redundant coolant circuit hoses for no possible reason routed the overflow hoses incorrectly to an engine breather connection !?!
I take it you've checked the coolant levels to make sure it's not a problem with coolant getting into the engine? But if the bike has been running and the oil level has risen significantly you'd definitely notice the oil emulsifying and probably mayonnaise around the filler cap if coolant was involved.
As Cl1ve2004 says this is an interesting thread.