hi all my scamp is running real rich right now, you can really smell the gas out the exhaust. my question is how do i change the mixture to lean it out? its a 225 with a single barrel. any help is appreciated. thanks.
Use a vacuum gage with a T fitting from the carb, adjust the timing for 21 in. vacuum, lean the carb until it just barely runs and then increase the idle speed until you reach 21 in. vacuum again. This is the ballpark for your engine running it's best, you can play with adjustments from there. This a default setting, I don't rely solely on timing guns when I'm tuning either as dampers have been known to slip over the years with high mileage.