They're only bad if you try to do it in the same fashion as you'd do a '21 - in situ is not a good idea, it's easier to get the carbs totally off and get the needle holders out, you need to undo the link between them and twiddle the adjuster right in to make enough room on the front cylinder carb.

So the length of the job is dependent on how easily you can get the carbs off.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread