Should I port my 090? I have a stock exhaust and it seems to get too hot when milling. I use 40:1 and let it rest after every cut. I just really do not want to burn it up.
My 090g (66mm OEM cylinder) came ported and I had MMWS do a 090AV. If your cutting very hard wood or using a 72" bar or longer you can notice the difference, otherwise you likely don't need it. Mine don't run any hotter or cooler than stock 090's.