My mother has a Victa Corsair which generally runs ok however lately it has become difficult to start for her although I can start it easily enough but it takes a bit of force. Is there anything that can be done to make it start easier ie require less strength? Also, it seems to require at least 2 pumps of the primer button, even though the carby plate with the primer button (as well as needle) has been replaced. The Victa sticker says one pump only, but I can't recall it ever starting with just the one pump.