Late 70's early 80's lawnboy running rich

Bigdave83

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Folks,

My stepdad gave me his old lawnboy a week or so ago since he'd bought a new Toro to replace it. He's always cared very well for this mower and I'm glad he chose to pass it down to me instead of junking it. He told me that it wasn't running right and he didn't feel like messing with it anymore and opted to replace it. Upon tinkering with it today, I got it to fire up and run, however it was smoking a bit more than it used to and was running very slow almost like it was choking out. I cleaned out the carb and checked the little filter that was in the line and all was clean. It's got good spark and a brand new plug as well. Upon trying to turn the adjustment screw on the carb, I got little to no results with it, in fact the further I turned it in the better it ran and performed it's best with the screw seated. I turned off the fuel valve and let it run out and right in the middle to the end of it doing this it sped up and started to sound like normal until it died out from lack of fuel. Any ideas on where to go from here? It is a walbro carb on this beast. Thanks in advance for any help.

Dave
 

Bigdave83

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I apologize for the mistake i researched the model number and it turns out it was made in 1991. Model number is S21ZPR. 4.5HP Commercial Engine
 

Phototone

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Jul 8, 2013
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Entirely possible that it is a float/needle/seat issue allowing the engine to stay flooded. Its an inexpensive repair to change out the float/needle/seat. Those cork floats sometimes become porous and soak up fuel and then don't float anymore.
 
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