. mower ran about 5 minutes, then made backfire noise and a huge, puff of white smoke emerged. i shut engine off immediately
Garden

Experienced gardeners share their insights in answering this question :
Check for spark at the plug.
If the engine has points and condenser . check to see if the points are good.
If electronic ignition, then it is likely the ignition module is the cause

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Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by: Overfilling the crankcase with oil. Incorrect oil grades. Operating engine at greater than a 15 degree angle.
The most common cause of black smoke is a clogged air filter. Replace your mower`s air filter and this should resolve the problem. If you`re still seeing smoke, the air-to-fuel ratio may be off, in which case the lawn mower`s carburettor might need to be adjusted (ideally by a lawn mower repair specialist).
Your lawn mower`s carburetor regulates the ratio of gasoline to air mixture. If the carburetor isn`t getting enough air, the mixture has a higher percentage of gasoline, which can create black exhaust smoke. It`s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor.
The more serious cause of white smoke is engine coolant leaking into the cylinders. That can be caused by a cracked or porous cylinder head or engine block, a leaking intake manifold coolant transfer port or warped intake manifold, or a failing head gasket.
White Smoke

In extreme cases, you will need to replace your head gasket. At the first sign of white smoke you can try head gasket repair treatment to seal the leak before you do serious damage to your engine.

If you have a riding mower like a lawn tractor and there is white smoke, this is usually an indication of excessive oil being added to the reservoir, or you may have a fault with the carburetor. It could also be a sign of a blown head gasket, but that is more rare.
White Smoke Coming From Exhaust: Explained

White smoke from your exhaust means coolant is exposed to your engine`s combustion process. In most cases, this is the result of a blown head gasket, but a cracked engine block or cylinder head could also be the cause.

White or Gray Smoke from Exhaust – Just like if you see white smoke from under the hood, persistent white smoke usually indicates a coolant leak. If there`s only a little bit, it`s probably condensation. Blue Smoke from Exhaust – If you see blue or dark gray smoke, that`s an indication of burning oil.
A faulty or dirty spark plug could be the reason your lawn mower won`t stay running. It might produce the initial spark, but the spark won`t be enough to keep the engine running if the plug is clogged with dirt and oil. Spark plugs are usually located on the front of a push lawn mower and connected to a black cable.
The white smoke is the engine burning off all the excess oil. The fix – drain the excessive oil, and idle the engine until the smoke clears. This may take 5 minutes or so. Too much oil will cause other problems, smoke, poor running, no running, leaks, engine damage.

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Spark plug it’s dry in not getting fuel to that
ANSWER : Clean your carb real good you will be amazed!!!!!!!!

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Will not start turns over has spark the engine was running and killed and will not restart
ANSWER : If you have good fuel to the plug and a good spark and it still does not start it could be a timing issue, check the flywheel key has not sheared.

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Mower made huge cloud of white smoek and shut off . mower was cutting off after 2 minutes, filled oil, replaced spark plug, changed fuel fitler. mower ran about 5 minutes, then made backfire noise and a huge, puff of white smoke emerged. i shut engine off immediately
ANSWER : Check for spark at the plug.
If the engine has points and condenser . check to see if the points are good.
If electronic ignition, then it is likely the ignition module is the cause

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Craftsman lt1000 starts up and blows white smoke it stays started for only a short time
ANSWER : Hi, replace the fuel as it may be contaminated, also change the oil as it may be diluted with fuel (you can smell it on the dipstick if this is the case). Regards Phil

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Dont know what type of oil to use – Toro Power Lawn Mower
ANSWER : Put straight 30 weight motor oil in it. Not 10W30 or any multi-viscosity oil. Straight 30 weight motor oil. If you’re doing a complete oil change, then you may want to use Synthetic 30 weight, which will last longer between oil changes and also make your engine last longer (but it costs more too). Best of luck to you.James

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I understand what you are saying about burning oil out of the cylinder. But the weird thing is that it runs fine at slow and full throttle, doesn’t smoke, but when you put the blades in gear and run for a few minutes, a blue cloud starts, so we shut it down, wait a while and try again, four times we have done the same thing. I’m talking major blue smoke. Wait a while and it ok until mower is enguaged. I’m affraid to keep running after the smoke starts. And remeber, I did tilt the mower when I changed the oil and filter.
ANSWER : Did you overfill the crankcase, sounds to me like the problem, did it do this before you changed the oil ?

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What type of spark plug and the gap size – Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series – Sens – A – Speed Walk Behind Mower – 10685
ANSWER : The Tecumseh Push mowers, most or all of the Tecumseh brands uses a Champion J8c, and the gap at .020.

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Spark plug gap – Toro Lawnmower 20099 Mower Mowers Lawn
ANSWER : Hi campbell7505

.28—-.32

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