4CornersPuddle
ArboristSite Member
I traded for a Husqy 455 recently. It's a low hours saw, well maintained, treated well.
After I reset the carb adjustment limiters and opened the muffler to the 85% outlet to inlet ratio, the saw really picked up performance, running smoothly, starting easily. It was quite dependable and impressive for what it is (a 455).
However, it has developed what sounds to me to be an erratic miss under load. It 4 strokes appropriately out of the cut and clears up to 2 stroke if I hold it up so it cuts "lightly". In other words, I'm not letting the weight of the saw influence the cut.
But if the rpms drop a bit, but not nearly to the "lugging" stage, it will begin to miss off and on, obviously losing power. I've changed spark plugs twice and looked for a loose wire intermittently grounding out. There does appear to be a very small gap between the kill switch wire electrode and its ground position when the switch is in the run position. My thought was a spark may have been jumping this gap at times. I pulled the wire from the kill switch and insulated it with tape with no change in the cutting out behavior.
Any ideas what could be causing this stutter?
After I reset the carb adjustment limiters and opened the muffler to the 85% outlet to inlet ratio, the saw really picked up performance, running smoothly, starting easily. It was quite dependable and impressive for what it is (a 455).
However, it has developed what sounds to me to be an erratic miss under load. It 4 strokes appropriately out of the cut and clears up to 2 stroke if I hold it up so it cuts "lightly". In other words, I'm not letting the weight of the saw influence the cut.
But if the rpms drop a bit, but not nearly to the "lugging" stage, it will begin to miss off and on, obviously losing power. I've changed spark plugs twice and looked for a loose wire intermittently grounding out. There does appear to be a very small gap between the kill switch wire electrode and its ground position when the switch is in the run position. My thought was a spark may have been jumping this gap at times. I pulled the wire from the kill switch and insulated it with tape with no change in the cutting out behavior.
Any ideas what could be causing this stutter?