Handling function in function default values

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Python

I am writing a function that calls on several other functions with default arguments. I have been explicitly passing every parameter of the inner functions to the outer function but this has caused the outer function parameter list to become very long. Is there a common way to handle this? Below is an example of what I have been doing and am looking for what is common practice.

class my_class:
    def inner1(self, arg1=1, arg2=2):
        return (arg1 + arg2)

    def inner2(self, arg3=3, arg4=4):
        return (arg3 * arg4)

    def outer(self, arg5, arg6, arg1=1, arg2=2, arg3=3, arg4=4):
        x1 = self.inner1(arg1, arg2)
        x2 = self.inner2(arg3, arg4)
        x3 = x1 + x2 + arg5 - arg6
        return x3

I primarily run the outer function and once in a while I might want to change the input parameters arg1, arg2, arg3, and/or arg4. I don't want to keep such a long list of input parameters to outer. What can be done here? Please provide an example as I am new to programming. Thank you!

What I have tried:

I have tried using __init__ to instantiate the variables but I do not want to modify the object every time I want to change arg1 for example.

I have looked into *args and **kwargs but because these are required function inputs, I am not sure this would work.