Quote:
Originally Posted by J-Mech
If you have a fixed jet Walbro, then something is wrong with it, (bowl over filling) you can't do any more than adjust the idle jet. Can't get it too rich. You asked me the other day what I think of them. Not a fan of a carb I can't adjust the fuel on. Sometimes I set them to run rich (like when I'm blowing snow and want the extra fuel to keep cylinder temps down). But, that said, as long as everything is up to snuff on them, they're ok. If it was mine, I'd look for a used adjustable one (Kohler or Walbro) to replace it. Just my 
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On it, I posted an add in the wanted section for a KT17 or M18 Carter/Kohler carb.
As far as something maybe wrong the Walbro I have; you said the bowl could be overfilling which may fit. When I had it apart last night, I pushed up and down (lightly) on the float to make sure it wasn't sticking and I suppose I could have pushed up on it too much and it could have messed with the fill level. Hmm, something to maybe look into