Yam F80 (2003 carb) carb sync (PSI)

[peterv6i]

Hello...
I have a yamaha F80 (2003 year).. I would like to resync carbs.. Can anyone tell me what is the "average" PSI of vacuum on "intake" side?

have a nice day
thank you

[rodbolt17]

no real average.
run the engine at approximatly 1100 RPM using carb 4 idle stop screw, adjust the top 3 to match number 4.
you may have to readjust the 1100 RPM during the sync process.
after the vacum is set then adjust the idle air mixture screws at about 800 RPM.

[peterv6i]

Ok! thank you! i will do it
Can you tell me which part on this image http://www.boats.net/parts/search/Ya...201/parts.html
is "air mixture screw"?

thank you..

[rodbolt17]

#5 is the screw,plug number 47 has to be removed to access #5.
easiest way to access it is while the carb is off drill through the brass plug with a 1/8TH drill bit.
screw in a #10 self tapping screw.
pop out with wire cutters.
if #47 has already been removed your ****en.
I usually set the screws at 3 turns out for initial setting.