After downloading parts drawings at B&S web site and a few trips to town for parts, I still have problems with my riding mower engine. We do not have a tractor yet and so this is the only chance I have at keeping the weeds at bay and they need taming badly. (I have a pull behind Rough Cut Trail Mower purchased at the Tractor Supply and it runs great. It has its own engine to run the cutting blade. I just need something to pull the mower.)
I have a 2Cyl B&S riding mower engine that is running rough. Smoke is black and sooty. Looking down through the carb with the air filter removed, I could see some liquid fuel at the bottom where the intake manifold bolts on and makes a 'T'. It also appeared that there was fuel around the base of the air filter as if too much fuel were being sprayed about. (I did not dare try to run the engine with the air filter off.) There is only one adjustment (Idle mixture) and it does not seem to do anything in this situation.
When I disconnect the fuel line and start the engine it still runs rough, but at the last instant the engine runs great for a second or two. Hooking the fuel line back up, and restarting the engine runs great for a short while apparently until the carb fills up with full and it runs rough again. The gas is only a couple of weeks old.
I cleaned the air filter, put on new fuel filter, new plugs, and put in a new carb/fuel pump kit. I could not get the needle valve seat out so it is original--it has nothing to grab onto or turn to pull it out. (any ideas?) I saw no grit in the carb when I pulled it apart and just a little fine sediment in bottom of the fuel resevoir. After putting the carb back together I got the same results--it ran great for a short while, then it went back to chugga chugga chuffa.
This tells me that the engine is cabable of running well (and the gas is not the problem). I don't think it is the needle valve since with the fuel line disconnected it still runs rough for awhile until the fuel is almost depleated from the resevoir.
Any ideas what would make it burn so rich?
Notes: B&S Model 42A606 Type 12380-01 Made in 1997. The fuel pump is the small rectangular kind on the front of the carb. The fuel resevoir is inside the carb and the intake manafold bolts on the bottom of the carb, then splits to the two cylinders.
By the way, thanks for the previous comments, but I need something else to try.
Thanks,
Dale (dh of mary,tx)
I have a 2Cyl B&S riding mower engine that is running rough. Smoke is black and sooty. Looking down through the carb with the air filter removed, I could see some liquid fuel at the bottom where the intake manifold bolts on and makes a 'T'. It also appeared that there was fuel around the base of the air filter as if too much fuel were being sprayed about. (I did not dare try to run the engine with the air filter off.) There is only one adjustment (Idle mixture) and it does not seem to do anything in this situation.
When I disconnect the fuel line and start the engine it still runs rough, but at the last instant the engine runs great for a second or two. Hooking the fuel line back up, and restarting the engine runs great for a short while apparently until the carb fills up with full and it runs rough again. The gas is only a couple of weeks old.
I cleaned the air filter, put on new fuel filter, new plugs, and put in a new carb/fuel pump kit. I could not get the needle valve seat out so it is original--it has nothing to grab onto or turn to pull it out. (any ideas?) I saw no grit in the carb when I pulled it apart and just a little fine sediment in bottom of the fuel resevoir. After putting the carb back together I got the same results--it ran great for a short while, then it went back to chugga chugga chuffa.
This tells me that the engine is cabable of running well (and the gas is not the problem). I don't think it is the needle valve since with the fuel line disconnected it still runs rough for awhile until the fuel is almost depleated from the resevoir.
Any ideas what would make it burn so rich?
Notes: B&S Model 42A606 Type 12380-01 Made in 1997. The fuel pump is the small rectangular kind on the front of the carb. The fuel resevoir is inside the carb and the intake manafold bolts on the bottom of the carb, then splits to the two cylinders.
By the way, thanks for the previous comments, but I need something else to try.
Thanks,
Dale (dh of mary,tx)