Vacuum Secondaries

Thanks everyone for the wisdom. I've only had the Duster a couple of years so I don't know how fresh the engine is. I certainly am not going to red line it at 7000 rpm waiting for the secondaries to open. I don't want to be picking engine bits up off the pavement. But from what I read here the 750 VS will work fine for a mild street engine if tuned properly. I'm going to pull the vacuum pod off and ensure everything is OK with it. I'll see what spring is in it and then decide on getting the kit to go to a lighter spring.
The engine is running rich, by the carbon on the plugs. So I need to learn tuning the carb correctly. I am going to buy the rebuild kit for the 650 DP and get it in shape, just because. Maybe for sale on here.