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That could be as much to do with the VM Mikuni choke/starter jet as it is known to be very rich.[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/hard-start.13148/post-185415[/URL]The 'rubber' tip of the choke/enrichment plunger can degrade so the choke circuit not completely shutting off could have been the cause of the rich idle on the 'old' Mikuni.
That could be as much to do with the VM Mikuni choke/starter jet as it is known to be very rich.
[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/hard-start.13148/post-185415[/URL]
The 'rubber' tip of the choke/enrichment plunger can degrade so the choke circuit not completely shutting off could have been the cause of the rich idle on the 'old' Mikuni.