Good morning all.
I have read this entire thread. A lot of things have been done and great suggestions made by VER. Earlier in the thread you mentioned that it has tremendous vibration due to a bent crank shaft. Just wondering why nobody has suggested replacing the crank shaft? The vibration is pretty bad as you had to stop and tighten the top cowl screw several times while sawing in the video. I feel that nothing will work properly with that much vibration. Vibration at high speed = resonance or harmonics. That alone can effect the operation of the carburetor not to mention the operation of the points. Maybe that is why someone went to the CDI?
The bent crank - perhaps I had glossed over that and not really spent enough time looking at that. (Wishful thinking on my part, hoping it wasn't really bent?
But you are absolutely right - if that is causing an amount of vibration that is really adversely affecting the rest of the saw's operation, then nothing else is really worth doing. I was hoping the vibration was more of an annoyance, but if the air filter cover won't stay on under power - then that doesn't make for a very useful (or fun) saw. I will try to get a picture or measurement of where I was seeing the "out of round" on the clutch side. My initial thought regarding replacing the crank - that may be a showstopper. On second thought, (depending on cost), I suppose it would continue to be a good learning tool for me. It's been great so far, and am really thankful for everyone's input/ideas/advice.
My second concern is what caused the original damage to the piston with the welded ring? Running to lean and overheated maybe? Straight fuel with no mix maybe? Foreign matter entering the intake? Something had to cause that. I'm just curious. These are just thoughts that entered my mind while reading the thread. Keep us posted. I really enjoyed reading your progress.
I can't remember if I posted this on this thread - I think it's buried somewhere here, but when I picked up the dead saw there was some missing hardware on the exhaust. One of the screws into the cylinder at the exhaust port was 1/4 way backed out. The exhaust would have been slapping into the exhaust port. And according to my father in law - he hadn't taken anything apart after the saw died (that he remembered). So it seems that something could have easily been ingested into the cylinder. Just a guess. I seriously doubt it was straight gassed, because we run a fleet of saws (meaning 5) and fuel them from the same "mix" jug when we're doing tree work. Not to say it's impossible, but I would think unlikely given our setup and keeping all the saw tools/fuel together.
And Patrick, your probably snowed and iced in like we are here in KY.
Have a great weekend. OT
No snow this time for us. All rain yesterday and today. Temp is reading 63 degrees F this morning - pretty wild! We've been having teens to twenties most mornings in the past couple weeks. Wild weather. Have a great weekend too, thanks for finding the thread!