My other scoot is a Big Dog Mastiff and I hope it's ok to ask for some help. It has an S&S 117 with S&S Super G Carb. My bike runs fine on a full tank of gas but after exactly 65 miles it acts as if it has vapor lock and hesitates on acceleration. I know it's not vapor lock because I have a vented gas cap and I've removed the fuel line (at the carb) and the gas flows fine. At 70 miles, the bike completely stalls. Sometimes I can restart it and other times I have to push it to a gas station. I have a 4 gallon tank and there's always at least 2 1/2 gallons left in the tank after it happens. I would appreciate any advise or insights. Thanks in advance.