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Very strange, D.
I have had one cylinder firing intermittently only when the connectors to that coil were somehow loose.
Rpms' relate to vibration and to carburetors as well, but speed relates to airflow.
Could it be that the airstream is putting pressure on some wiring?
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Motofool 
.................................Never ride faster than your guardian angel can fly
"Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
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