yes, it's fine to spray into the carb
then if there are any accesible areas it would be a good idea to give a rub around with a cloth before the carb cleaner evaporates.
it's ok to clean all 4 at the same time or just 1 at once
(ps don't spray carb cleaner into all 4 carbs then strike the bike up, leave it a couple of mins before starting)
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