Google search found this "TRhe heart of any chainsaw engine is the cylinder. Some have chrome plated cylinders...and sooner or later the chrome starts to peel off..kaput !
Some have chrome impregnated cylinders, where pressure drives some chrome into the pores of the aluminum....somewhat better.
The best saws have a thin cast iron liner for cylinders...they are more expensive to produce, but make a much longer lasting engine..
Just my two pennies.... ""