Well I found a replacement filter last night and tried that too but still no dice - it starts bogging at 4500rpm on the road, and won't rev over 6-7000rpm - although the exhaust note seems to 'pop' more at idle now.

Any tests I can do? I have got a wideband O2 meter at the workshop so I might try that next.

Looks like the carbs are coming back off though!
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MC21se