Do any of you that have a firewood processor ,that uses a chain saw to cut the logs find that after time the chainsaw "jams" when about halfway through a log.I ask as I have an old JAPA 2100 Firewood  Processor and after quite a few loads ,the chainsaw jams when about half way through cutting a log. What causes this? I assume it is the VERY fine burr that gradually builds on the chain bar, as I find once I file the burrs of the bar works ok. That said the burr is SO fine I find it hard to b