An appropriate tank size for a forty, fortysix eight to ten ounces and for a Sixty one is ten to twelve ounces. Everyone is always trying to stuff bigger and bigger tanks in and forgets that using oversize tanks on suction/muffler pressure systems for a given size engine will reduce the fuel delivery capability.

In other words using an oversize tank unless it is a pumped system will hinder the ability to have a uniform engine run from full to empty tank. Its not unusual to start experiancing shorter flights with a bigger tank.

John