Posted by Dave41A on April 14, 2020 at 07:18:30 from (71.161.70.176):
In Reply to: Chain Saw Help posted by Dave41A on April 13, 2020 at 09:37:40:
As a follow-up to everyone who responded, I took the suggestion of using gas instead of starting fluid. I poured about a teaspoon down into the carb body/choke opening. Then after a few pulls it fired and would even run at idle for maybe 10 seconds. Took out the NGK plug and put in a champion--made no difference, so put the NGK plug back in.
I took a look at the Walbro carb linkage and found that the choke lever was binding/hitting on the inside of the air cleaner assembly (a piece of plastic). This prevented the choke from fully closing, and also did not allow the lever on the choke plate shaft to "latch" with the throttle shaft to "set the throttle." This is unrelated to the current problem but does explain why the saw was always hard to start when hot, as the choke is supposed to hold the throttle open about 1/4 until the handle is squeezed, releasing the choke and the throttle at the same time. I ground the plastic away in the offending spot with a rotary grinder and after some trial and error can now set the choke and throttle like I should.
Anyway, I can now get the saw to reliably start, but it will only run at half choke, and then only for 20 seconds or so. After squeezing the throttle lever and dropping to low idle it will stall. So I am thinking there must be some obstruction in the carb idle jets still in there and/or a pinhole leak in the gas lines that is interfering with good fuel flow and/or a diaphragm problem (or all three). I tried it with the fuel filter removed and that made no difference, so I do not think it is the filter, although it is the original (5 yrs old) so probably time for replacement anyway.
It will be a few days yet when I get back to this but will post my results if/when I make any progress for the benefit of anyone with a similar problem. Thanks to everyone with the good suggestions. I learned something about cord wood houses anyway. Pretty interesting--but looks like a lot of work. Dave
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