Ahh that makes sence that its older than a year old. That 163 gasket is the one that goes between the air cleaner backing plate and the carb its self. That one i have seen cause starting issues because if it leaks, primarily due to a warped backing plate it wont let the primer bulb pressurize the bowl of the cab to enrich for cold start. not sure if yours is equipped with a choke vs a primer bulb however. This gasket has zero to do with the carb its self, but could cause a potential no/hard start if its a primer style.