Clivette

Hi, I've had the bike for two weeks now and just can't ride it smoothly. It seems as if it never warms up with the throttle lag. I adjusted the air bleed screw from one and a half turns out to half turn out with slight improvement but no cure. New spark plugs and filters, new fuel. Any help greatly appreciated. I am afraid the sudden jerking through the transmission will harm it. The chain has been adjusted too. Many thanks.