motorcycle engine has two side cover, one is left side cover, another is right side cover. Both side covers are to potect the engine parts. And it also has the cooling function. The Engine Cover
mainly is made by iron in silver cover, and some in black. good quality engine covers are also to last a vry long life to protec the engines. since it is a very stonge material, and protect well engine inside parts, mostly only need to change the cover for replacement if any accident happened.