Anti-freeze AGAIN sorry

Thanks everyone for the suggestions.
Will check the expansion bottle thingy (thanks Greg) but I suspect it might
be head gasket. Will keep checking water level & hope for the best for now.
But was I right about the system taking about 6 litres & therefore needing
about 1.5 litres of antifreeze?
And was it OK to bung it in without draining the system? And is there likely
to be a drain cock somewhere near the bottom hose cos I can't find one!
Should I just unclip the bottom hose to drain it?
Oh & another thing is sometimes when I rev it, it doesn't  die down as
quickly as it should. Is this air getting in to the carbs maybe? Maybe I
just need to save up & treat it to a visit to the nice man at Milwoods.
Vic.
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