I've got a 27 year old Homelite 540 chainsaw (28 inch blade) I'd like to use. I got this saw in 1989 for Hurricane Hugo clean up. I haven't used it since. Now thanks to Hurricane Matthew I have some big trees to cut. The saw has a Champion CJ6 in it now. Homelite calls for a CJ6Y. And I have a box of Champion DJ8J sparkplugs on hand that I use in my other chainsaws. Does anyone know if the DJ8J is the wrong heat range for the 540? The parts stores are closed here due no electricity.