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download from here, click the Latest Stable Kernel button
https://www.kernel.org/
download the xz file
extract with "tar xJf"
��� for your information ���
       -j, --bzip2
              Filter the archive through bzip2(1).

       -J, --xz
              Filter the archive through xz(1).

       --lzip Filter the archive through lzip(1).

       --lzma Filter the archive through lzma(1).

       --lzop Filter the archive through lzop(1).
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then cd linux-4.9

make menuconfig

make

`
 Once configured, it is time to compile and install the kernel. You can run needed commands in one line by separating them with double ampersands (&&) as written below. This may take a long time.

    make && make modules_install && make install
    You may want to use -j option with make. This allows to fork additional processes for compiling kernel, syntax would be "make -j 3". 3 here represents the number of processes to be created.

`
`
So the kernel is installed, but you need to make it bootable.
`
##### here natually comes the question: making your kernel bootable

wait...



follow this guide
http://www.thegeekstuff.com/2013/06/compile-linux-kernel/

a more detailed guide
http://www.wikihow.com/Compile-the-Linux-Kerne