I have a Toro GTS 6.5HP Self Propel Gas Lawn Mower and it was running fine but it started acting up so i had to pu in new oil. i started it up again and it started spitting of clouds of smoke. it died so i tried starting it again and after pulling the starter rope for the 120th time it started again and i started cutting the grass and the smoke(which was white) puffing out little clouds every time i went across the more bumpy part of the lawn. all of a sudden it died and wont start back up. it will turn and the engine will go for a few seconds but it wont really start up.
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Re: Oil causing a problem?
Sound as if you have too much oil in the machine. Anytime you see white or lite gray smoke it is a sign of too much oil. Before you go through the routine of cleaning the oil out of every nook and cranny, try unscrewing the spark plug and clean it with a soft rag. It would have oil on it preventing the machine from starting. If this does work and there isn't a lot of oil in the gas tank now, just continue running the engine until the smoke clears. It won't hurt anything. But if cleaning the plug doesn't help you will have to empty all gas and oil from the gas tank, refill with new gas, squirt a little gum out carb cleaner in your carb to remove any oil there (this can be done when you try to restart the engine). Remember, when you are mowing grass if you are mowing on a hill) of any knd, make sure to turn the mower so the gas tank is on a higher level than the oil.
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You may have MAJOR damage to your motor because of overfilling the oil.
Sometimes you can bend or break a piston rod when the engine is overfilled.
Meanwhile you can check a few other things.
Take your plug out and ground it against the head of the engine with the spark wire attached to it.
You should get a bright blue spark, if not then check your ignition module, it may be faulty.
If you have spark, then try putting a little bit of lighter fluid/or gasoline in the cylinder and reinstall the plug and try to crank it...if it cranks, then you may need to clean/rebuild your carburetor.
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Check your oil level and condition. Most new motors have oil sensors on them that turn the motor off if the oil level is too low or in bad condition (old). If the oil level is low and you go on an incline the oil that is in the motor will flow away from the sensor and it will 'think' there isn't any oil in the crankcase and cut the motor off. The sensors are usually on the back side of the motor so going straight down hill will cause the oil to run away from the sensor, if it's really low sideways tilting can cause the same effect. If this is the cause the motor should start fine when level.
Depending on what engine is on your Toro lawnmower, there may not be a oil plug under the mower deck. A briggs and stratton engine will have one, but if the unit has self propel then you will have to move the guard over the self propel cable. This is a 1/2 in bolt, you will also have to loosen the other bolt to swing the guard around.
On a Kawasaki or Honda, and even if you have a Tecumseh engine then just start the mower up for a few minutes and let the engine oil get warm, then shut the engine off and then lay the mower on the side that has the oil filler cap and put your drain pan under the oil filler cap. You can then drain the oil out of the oil filler tube. You can also do this with the briggs and stratton engine. I find this to be a very convenient way to change the oil. Then put fresh oil back in the unit. I always suggest to put the engine manufacturer's oil back in the unit, or if that is not available then use another oil from another engine manufacturer. IF you use automotive oil, the oil will break down faster since the heat level for the engine on car is less than that of the engine on your lawnmower. The engine has a water cooled design, that keeps the engine temperature from raising over about 250 degrees F. The engine temp on your lawnmower can get as hot as 400 degrees F in the summer heat and being run for 30 minutes or longer. A longer answer than you had hoped but I hope the information keeps your lawnmower running well for many summers to come. :)
You overfilled the oil. If the mower runs, just go ahead and mow grass until it runs the oil out of the gas tank. Or you can empty the gas tank and fill with new gas. White smoke is not a serious problem. Only a hassle.
Your carburetor needs cleaned,you had gas in it that you drained out and replaced with new ? What engine do you have tecumseh,briggs,? Anyway remove carburetor and take apart get acan of carburetor cleaner and spray though jets in carburetor and blow out jets be carefull not to blow out needle seat !