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Hi Peter,
Sounds like they just need a little "going over".
Inspection first, fuel pressure within 2.5-3.5, airflow balanced at idle etc.
Ensure all jets are snug.
If the airflow balance is out, it may explain some rough running.
Sounds like we need to know all the details of the carbs for jetting.
Should not be that fumey.
Open stack carbs can be smelly since the fuel fumes aren't contained by an aircleaner.
Gary
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