Comment 7 for bug 90283

Or course, the problem is neither with kpkg-make, nor with the kernel source you use. It's your kernel config file that has the "Compile the kernel with debug info" option enabled.

Disable that option from the config file (edit it or do make menuconfig), clean your source folder, recompile and you'll get a normal size package. There ain't no bug there. Read my previous post and check the link on help.ubuntu.com. Somewhere in the middle of the page it tells you why you get huge packages when compiling with the stock Ubuntu kernel config file.