decarbonising/decoke enfield cylinder head-piston

after a problem with a broken oil  pump (feed) http://homoratus.blogspot.gr/2012/08/engine-problem-bad-news.html , i had to open my bullet's engine. So i try to decoke its aluminum and full of carbon cylinder head. We must use only mechanical ways to clean it (no chemical) just gasoline and nothing more.

At start, i had a problem with the cylinder head of the engine. I could not remove, so i tried an "old fashion" way. I heated it with full of attention. At the end, the head was removed with success.

As you can see, there are many of carbon remains 

 The tools i used were a paintbrush, some wire brushes, electric drill with a wire brush tool and a  metal tweezer.

 Take a bowl with gasoline and put the items there. Take the paintbrush and a sand paper and remove the carbon as best as you can. Then try with the electric drill with the wirebrush tool. Please be gentle because the valves are from steel but the the cylinder head from aluminum, so you don't want to hollow out or trench your cylinder head. You will repeat the same way for your piston too (try with a cloth with gasoline to remove the remains from the piston rings).

I have to say that i polished the piston with a brush that i use for aluminum with the electric drill, but don't forget to clean carefully the piston with gasoline after that.