I've got an MC18 R5k but to to a combination of circumstances it ended up being laid up in my mum's garage for a few years. Lokking at it and trying to get it back on the road and of course it's seized

Does the engine have to come out to remove the carbs - I think they'll need cleaning.
Is it better to take the heads of in situ to have a look or am I really better off just dropping the engine out.
This could be the beginning of a long running saga
Thanks in advance - Dave