spyfly

Also pays to remove the rave valves and clean the carbon off or they may stick .you will know when they stick, 628 will run rough when power setting is changed as one will stick open and when power is reduced only one will close

Should be rotec. Bloody spell checker

Bruce .I tried a rotes. When I leaned out until the jab started to falter I had three on the lean side of peak and one still on the rich side.i.e. when I richened three went up and one down so I don't think that will cure your problem.