Posted: 4/28/2017 7:51:11 PM EDT
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I have a 2012 toro recycler mower that I cannot get running right. The motor is a Briggs 190cc.
It is running very rich. Runs slow, but if I remove the air filter it comes up to speed. The air filter is new. Installed a carb kit , fresh gas and new plug. No change. Just installed a new carb thinking the old one had some issue I could not see. Still runs rich. With the air filter on it runs slow. With the air filter off it runs faster. At first it was a challenge to see if I could fix it, but it's one step way from the dump. |
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I have a 2012 toro recycler mower that I cannot get running right. The motor is a Briggs 190cc. It is running very rich. Runs slow, but if I remove the air filter it comes up to speed. The air filter is new. Installed a carb kit , fresh gas and new plug. No change. Just installed a new carb thinking the old one had some issue I could not see. Still runs rich. With the air filter on it runs slow. With the air filter off it runs faster. At first it was a challenge to see if I could fix it, but it's one step way from the dump. |
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When you installed the carb kit, did you change the jet? If so, the jet may be too large.
Did you remove the emulsion tube? They are easy to install upside-down. I work on small engines for a living, if you could post a video of it running I'm sure we can figure it out. |
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If you changed the carb it just about has to be the fuel.
I suppose it could also be the plug, but that seems unlikely. I would change the gas and plug and see what it does. I'm curious to know the answer though. ETA Just to clarify I would change the gas and plug again. |
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When you installed the carb kit, did you change the jet? If so, the jet may be too large. Did you remove the emulsion tube? They are easy to install upside-down. I work on small engines for a living, if you could post a video of it running I'm sure we can figure it out. |
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If you changed the carb it just about has to be the fuel. I suppose it could also be the plug, but that seems unlikely. I would change the gas and plug and see what it does. I'm curious to know the answer though. ETA Just to clarify I would change the gas and plug again. |
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no choke cable. Auto choke working correctly Go to 4 minutes on this vid https://www.youtube.com/watch?v=XR8IxkVd3Jw It will show you the thermostat. I have to spray mine from time to time with some lube and work it back and forth with a screwdriver to free it up. I don't take anything apart, you can see it and get to it above the muffler. |
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Disreguard. You had a new air filter.
It possibly could be the filter used. It might be too fine a filter and cleaning smaller micron for the engine to suck in the required air needed. You could punch a couple 3 or 4 small holes in filter to see if that would help to bring up engine's needed RPM to work while still filtering. OR, you could make a filter out of foam to replace the paper filter to see if that would work. Like foam oil-impregnated filters for performance vehicles. |
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Double check that all the carb linkages are in the correct place.
I got a free newer toro with an automatic choke that wouldn't run right. After tearing it apart a couple times I ended up noticing that the guy who worked on before me had fucked up how the linkage was put on. Putting it back together correctly made it run right again. |
 How Change A Ready Start Carburetor To A Primer Carburetor On A Briggs And Stratton Motor FWIW, I scrapped my recycler, before I knew this was an option |
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You know the "Auto Choke" is not a choke in the conventional sense at all that is part of a carburetor. It is a temperature controlled coil rheostat that blocks exhaust flow on the exhaust port and is on the muffler side. Go to 4 minutes on this vid https://www.youtube.com/watch?v=XR8IxkVd3Jw It will show you the rheostat. I have to spray mine from time to time with some lube and work it back and forth with a screwdriver to free it up. I don't take anything apart, you can see it and get to it above the muffler. |
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Quoted:
Disreguard. You had a new air filter. It possibly could be the filter used. It might be too fine a filter and cleaning smaller micron for the engine to suck in the required air needed. You could punch a couple 3 or 4 small holes in filter to see if that would help to bring up engine's needed RPM to work while still filtering. OR, you could make a filter out of foam to replace the paper filter to see if that would work. Like foam oil-impregnated filters for performance vehicles. |
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No, a bad head gasket can allow an engine to run lean (by sucking in air through the blown gasket), but not rich. Additionally, generally speaking, the blown head gasket greatly reduces the compression. On a single cylinder engine, you would have great difficulty getting it started with a blown head gasket due to the lack of compression.
I would approach it in this order: Check for any vacuum leaks, I don't think this is the problem but super easy to do. While the engine is running, spray some break cleaner behind the carb-intake around the gaskets and intake manifold. If the RPMs change, you found the problem. Make sure everything is installed correctly. Check the gasket stack and linkages. You can find diagrams on google that show where everything should go. I can't even count how many time I've seen people install gaskets, spacers, and linkages incorrectly. This may very well be the problem. I don't remember if these carbs have an adjustment or not; but if it does, try to lean it out. Remove the flywheel and check if the alignment key has been sheered. Check valve lash. I wouldn't waist too much time checking for spark issues. With these engines; if it runs, the spark is (generally) good enough. |
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I have a 2012 toro recycler mower that I cannot get running right. The motor is a Briggs 190cc. It is running very rich. Runs slow, but if I remove the air filter it comes up to speed. The air filter is new. Installed a carb kit , fresh gas and new plug. No change. Just installed a new carb thinking the old one had some issue I could not see. Still runs rich. With the air filter on it runs slow. With the air filter off it runs faster. At first it was a challenge to see if I could fix it, but it's one step way from the dump. Havig not read other replies, cut me a bit of leeway That aside: If this is a briggs that has the carb mounted above the fuel tank, check for a perforated disc. If it shits gas out the inlet when tugging the rope, this is a symptom. Otherwise, it it runs fine sans filter, check the breather hose. If it runs fine with filter and no breather, you have issues, usually related to infrequent oil changes or extended service. Really though, 99.9% of small engine issues I encounter are due to shitty ethanol adulterated fuel. |
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No, a bad head gasket can allow an engine to run lean (by sucking in air through the blown gasket), but not rich. Additionally, generally speaking, the blown head gasket greatly reduces the compression. On a single cylinder engine, you would have great difficulty getting it started with a blown head gasket due to the lack of compression. I would approach it in this order: Check for any vacuum leaks, I don't think this is the problem but super easy to do. While the engine is running, spray some break cleaner behind the carb-intake around the gaskets and intake manifold. If the RPMs change, you found the problem. Make sure everything is installed correctly. Check the gasket stack and linkages. You can find diagrams on google that show where everything should go. I can't even count how many time I've seen people install gaskets, spacers, and linkages incorrectly. This may very well be the problem. I don't remember if these carbs have an adjustment or not; but if it does, try to lean it out. Remove the flywheel and check if the alignment key has been sheered. Check valve lash. I wouldn't waist too much time checking for spark issues. With these engines; if it runs, the spark is (generally) good enough. |
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once running the governor arm goes to fill open but the motor does not speed up To me it sounds like your gov/control arm is off. Its rare to find a valve issue on a motor like this. Unless it has a bunch of hours on it. |
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So there is no extra movement in it at all? Are you sure a spring didnt get moved to the wrong hole on the carb or governor? To me it sounds like your gov/control arm is off. Its rare to find a valve issue on a motor like this. Unless it has a bunch of hours on it. Could there be a valve or motor issue causing this? There is some smoke blowing into the air filter box when it's running. |
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Plugged exhaust. Check to make sure mud daubers haven't blocked off most of the muffler, it will act exactly like OP describes.
It will NOT rev up if it cannot rid the combustion chamber of spent gasses. One might assume the force of the exhaust gasses would clean out the mud and such, it will not. |
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Plugged exhaust. Check to make sure mud daubers haven't blocked off most of the muffler, it will act exactly like OP describes. It will NOT rev up if it cannot rid the combustion chamber of spent gasses. One might assume the force of the exhaust gasses would clean out the mud and such, it will not. |
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Plugged exhaust. Check to make sure mud daubers haven't blocked off most of the muffler, it will act exactly like OP describes. It will NOT rev up if it cannot rid the combustion chamber of spent gasses. One might assume the force of the exhaust gasses would clean out the mud and such, it will not. |