G'day folks,
It looks like the jet was changed in the 1977 Twins, to the same as in the 125/160 engines.

See this past thread: https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/38878

Mr Davis doesn't seem to have gotten around to posting the further 'carby info' mentioned in the first post, worse luck.

Cheers,
Gadge

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