It was only a matter of time before Honda started using the MC28 barrel as a replacement for the MC21 as they are so close to being the same.

I thought I had a port map of a MC21 vs MC28 that myself and Andy did years ago but can only find MC18 and MC21 ones right now.

I might have to do another to show the difference and send it up to Andy to scan.
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If I have to take the carbs off once more...