It is not really necessary if you have the tools. For those screws, a t40 t40 torx tips that allow you to disassemble the carter without removing the change. As for what you say about the loss of the carter, it surprises me. The jtd carter is stuck with a polymer that even after removing all the tonillos costs two c **** is to release it and say it from experience. These engines give more oil losses problems due to the cranks of the crankshaft or the balance of the rocker lid than by the carter. Just make sure before removing the carter at all.
Greetings.