fearofpavement
Trying them all
Yes. Pressure tested to 10psi and vac to 10"Did you vac test also?
Yes. Pressure tested to 10psi and vac to 10"Did you vac test also?
I wonder if it developed a leak since?Yes. Pressure tested to 10psi and vac to 10"
Well anything is possible but I was pressure and vacuum testing because it had this problem.I wonder if it developed a leak since?
What is the history of the saw how did it develop?So, either I have a bad engine or something is wrong that I already "eliminated". I've got $12,000 worth of labor in this saw so need to get it figured out. lol.
Unless somebody can think of something that would cause this bogging, poor tune, lack of power thing that I missed... I think I've hoed up all the ground...
Someone didn't read the thread. All the history and process I've been through is in there.What is the history of the saw how did it develop?
Did he replace the coil with a known good one?Some saws are a waste of time to try diagnosing. I rip the junk completely apart and BUILD it right, NO more hassle!!!!!!!!
As most listeners and critics said to Mozart, "Too many notes."Did he replace the coil with a known good one?
Was it ported? Aftermarket cyl or piston? 135 lbs compression don't sound great is the piston worn out?
Been there and done that when I upgraded a 310 to a 390. The crank bearings were shot and three of the steel balls were missing from the races. Lord knows where they went or how they broke loose. Both seals were also shot. Right front bar stud was frozen. I gave up trying to remove it. Flywheel has to be removed.I just had an epiphany! I have been wracking my brain (what little there is of it) regarding what this issue could be and I am just now recalling a Stihl 029 Super I had a similar issue with a couple years ago. In that case, it turns out the piston skirt was broken which changed the porting. I'm wondering if this is something similar. Anyway, that's where I'm going next. Into the engine. It's the only place that hasn't been visited... I'll post my findings.
I just had an epiphany! I have been wracking my brain (what little there is of it) regarding what this issue could be and I am just now recalling a Stihl 029 Super I had a similar issue with a couple years ago. In that case, it turns out the piston skirt was broken which changed the porting. I'm wondering if this is something similar. Anyway, that's where I'm going next. Into the engine. It's the only place that hasn't been visited... I'll post my findings.
Inquiring minds want to know...Heading out to the shop now to investigate the issue...
Good work persistence pays now you can sleep , maybe!Problem solved. I have finally discovered the issue. I'm fairly thoroughly angry at myself for my poor memory. The piston had a piece of skirt missing from the intake side (pics later). I'm mad at myself for two reasons:
1. I have encountered this previously and went through a long diagnosis process for that. It was an 029 Super.
2. If I had been more diligent in my cylinder inspection, I could have seen this issue as it would have been visible through the intake port. And I had multiple opportunities to view it during all the carb changes. Duh!
Rather than just change the piston, I put in a new Huztl kit (after spending some time on it with the grinder)
I haven't put it in wood yet but do have the saw ready to go with bar and chain. I can't believe how many hours I've invested into this critter. Maybe gonna put it in my line up for a while and extract my vengeance from it.
Anyway, this long saga is coming to a close. Thanks again for the ideas and support.
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