Since my '70 CT70KO was running much too rich so adjusted the Carb Slide Clip one increment and now it's way too lean. Can't get that chocolate brown. The Manual says Spark Plug Gap is between 0.24 and .027. Does that make much difference? I've tried a cooler spark plug NKG-CR7HSA and then tried again, but didn't really make much difference. Could it actually be because I didn't install the back Air-Filter boot when I replaced the fuel lines?