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Stumped on Stihl BR450 Blower Stopping

lehman live edge slab

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Thanks for the last couple of replies. I have replaced the coil and plug. There was nothing wrong with the original coil. I am convinced the issue is not ignition related. Earlier, I mis-spoke about the fuel/oil ratio. I have only ran 50:1 ratio. I used to have a Lawn Boy mower that was 32:1, and had it on my mind I guess. Last weekend I installed the Stihl carb kit, which consisted of the diaphragm and the piece of film on the other side of the carb that has the two little flappers for the crankcase pulses to pump fuel. The blower ran normally. Yesterday, I ran it and it had the issue again. I found that I could jump up and down, and shake the blower from side to side on my back, and get it to pick up power again. The neighbors probably thought I was crazy. Some times I did have to let it get back down to idle, to let the fuel supply catch up it seemed, and once or twice it stalled out, but I was able to get all the work done that I needed, where before, it would starve out completely and not re-fire for awhile.
Sounds like faulty vent to me, shaking the blower would pressurize the tank to a point. I’m leaning towards tank vent and of filter. I’m sure you changed filter but question is was it oem or aftermarket? Some cheap filters don’t flow properly and or come apart inside.
 
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