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wrote in message oups.com... : Pop wrote: : It sounds to me like the carb might need a good degunking. : Probably plugged or partially plugged jet/s. Try screwing the : needle valves in (gently!) and back out a few time,s then put : back to where they were and see if it helps. If not, perhaps : something's plugged. : You did check for a waterlogged/plugged fuel filter, right? : Fuel's getting TO the carb? : : HTH, : : PopS : : I'm thinking too that it's gunked somewhere. Fuel _IS_ getting to the : carb (if you pull the starter rope gently with the air filter removed : you are met by a mist of fuel around the choke valve). Haven't played : with any fuel filters. Is there supposed to be some sort of linkage to : open the choke plate? It's just that I can't see how it opens on it's : own (vacuum effect???) and that would explain richness symptoms on : the(new) spark plug and exhaust output popping. : Well, -something- should open the choke plate, yeah. Is it staying closed or partly closed? If so, that's your problem, or at least one of them. Sometimes it's not obvious what keeps them open so look closely. There could be a spring disconnected that holds it in the open position or something real simple like that. D Matel gave you a great rundown on how to set the idle/hi speed mixtures, BTW, so I'd keep that handy. It's "standard" stuff but not always easy to remember and completely foreign to a lot of people. His method will work 100% if all is right with the carb and engine. A closed or partially closed choke though will certainly make an engine run rough or not at all by starving it for air. I suspect you've come upon the problem if you're relating it correctly. Your original post has been snipped out so I don't recall the original details, but it's fairly UNcommon in my experience for a small engine, esp a B&S, to operate on vacuum. At least I've never seen one; if I'm wrong, someone will be along quickly to correct me, I'm sure g. If there is no seperate cable to close the choke, which there probably isn't on that small an engine, it may be controlled by a centrifugal force wire when the engine is running and the positon of the throttle. I never thought much about it because it's always seemed "obvious" to me when I looked at them, but darned if I can explain it very well right now. Maybe Mr. Martel will come back and explain; something tells me he knows what he's talking about. Or he had a manual handy g. If you don't get anywhere and no one offers furhter assistance, come on back after you study the choke/throttle linkages a bit and I'll go see exactly what my B&S engines do; have three of them. I will say this: When you're assessing the choke plate position, do so while the engine is running (or trying to). I do recall that the choke plate on my push mower is mostly closed when it's at rest, which is fine with me: Keeps the spiders out over the winter! HTH a little at least PopS |
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