choke working or not ,

[crestcutter]

Hi I have recentlypurchased a Yamaha F80 2002,I was havin problems starting the engine on cold starts ,then after some time worked out that if i pull the fast idle lever all the way up ,it finally kicks over ,i have flooded it a couple o times b4 i worked this out ,after it starts it wants to rev but being cold idont want to let it,so i slowly bring the lever back ,sometimes it stalls ,then lever back up and she fires ,How do i tell if the choke is working,or isnt ,could the idle be too low ,could the carbys be dirty ,please help any information appeciated,Once started and warmed up,then run ,stop it ,then , she starts with almost half a turn of the key.Any ideas as to what is going on .

[rodbolt17]

the F80 has no choke.
its an automatic enrichment electrothermal valve, 2 actually.
one or both may be stuck shut.
or the carbs are dirty.
or both.