I am running out of chainsaws to begin with. Few months ago the Still 045 lost its sparks, then the Sachs 117 had a carb problem I couldn't fix and now the 2 Pioneers both have fuel problems. P39 and Farmsaw. Both will fire when the cab is primed. Replaced fuel filers that needed it. Replaced carb gaskets in both saws and nothing. I hate to give up on the Pioneers but am at a loss. But on the other hand at my age do I really need these saws?