:clue: Hey all; I just found out a great way to clean out all the goop and carbon out of your cylinder heads; bike etc. I tried the product "Simple Green". Once I got my cyclinder and exhaust components all apart for a rebuild, I then poored some of this Simple Green into a 5 gallon pail with hot water, let it soak for a little and the goop and carbon comes off pretty easily. The product is safe for all parts aluminum, plastic, rubber etc. It is biodegradable and easy on your hands. (Gee...I should get some royalities from this company) I use it on everything else. Works great! :worship: