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Bulletin G4 Carburettor - 1975
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=67386

Bulletin Series 70 & 80 Head Numbers - 1977
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=38893

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