Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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The engine starts but there is black smoke coming out and oil all over the spark plug when i pulled it out. it also doesnt run smooth at all before it finally just dies after a few seconds. the piston is covered in what appears to be burnt up oil and also the valve..any help would be helpful

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More than likely a blown head gasket. Requires removal of the cylinder head, replacement of the gasket, and knowledge of how to reset the valve clearances when reassembled.

Posted on Apr 29, 2010

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My cub cadet sc 100 won't start after putting it on it's side to sharpen blade.


Since you put it on its side, you most likely dumped all the oil from the crank area to the cylinder and carburetor. What you need to do is check engine oil to be sure it is full. Then take air filter off, clean the carburetor with carb cleaner. Remove spark plug, clean spark plug with carb cleaner. Pull the cord about a dozen times WITH THE SPARK Plug removed. Then install spark plug and try to start.

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After changing engine all lots of white smoke can out and now the engine will not start


White smoke comes from water, blue from burning oil and black from too rich a fuel mixture. If the engine was running before the oil change occurred then perhaps you put in far too much oil. This can force oil past seals and into the combustion chamber resulting in thick smoke. Carefully check the oil level on the dip stick for the correct fill level. If there is too much you must remove the overfill. If oil has entered the combustion chamber the plugs may be fouled. Pull one out and examine it. If it is not gray and clean you must clean them all before the spark will jump the gap and the engine can run. If the engine did not run before there is a great chance , based on white smoke, that water is entering the combustion chamber.

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Ford laser 99 no power


Hi there.
well when you throttle up to about 2000rpm do you get blue smoke coming out the exhaust.When driving on flat road will it power up as normal with out missing or getting hot.
what colour was the old spark plugs were they black or light brown.
When you start engine and run for 3 minutes then let it idle and remove oil filler cap do you get smoke coming out.
Number 1 if yes then engine is lacking power due to piston rings worn answer rebuild engine.
Number2 spark plugs brown [good] if black soot as num1.
Number 3 if you get black smoke or blue ,then the engine is lacking compression could be your problem as num1
OTHER WISE GET YOUR TIMING CHECKED AND SET TO BOOK.

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Engine race and new spark plug is rust carbon every 5-10km


1.check your engine oil level. 2.check the silencer whether black smoke or blue smoke? in case black smoke, airfilter is blocked and improper air/fuel screw adjustment in carburetor. in case blue smoke,the oil burns inside the cylinder, check the valve clearance or the cylinder need to reboring or replacement along with piston....

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Spark plugs foul immediately


Fouled plugs may be caused by oil leaking into the cylinder. Does it smoke when running (cold), are you using up the crank oil. Black smoke is excess gas comsumption, blue smoke is oil burning. If your plug is fouled with black carbon, you are most likely running to rich.

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Smells like it is running rich? blue coming out pipes. Not tons, but enough,and guys riding behind can smell the bike running rich..


Blue smoke usually indicates that engine oil is being burned; black smoke usually indicates that your engine is running rich. Blue smoke usually has a more "rich" smell; black smoke may smell like gasoline (which is exactly what it is--partially unburned gas). (White smoke would indicate that you're burning coolant--usually the sign of a leaking head gasket.) In your case, I'd hope for black smoke over blue smoke. It's usually much cheaper to fix one than the other.

It's likely that you are having a problem with one (but not all) of your cylinders. One way to diagnose what's going on is to pull the spark plugs for each cylinder. Each should appear more or less white, possibly with some spotty deposits on it. A spark plug that is covered with fluffy black carbon isn't completely igniting the fuel in the cylinder; this could indicate a bad plug, a weak coil, or a carburetor out of adjustment. A spark plug that is oily shows that oil is leaking into the combustion chamber, most likely through worn valve guides or possibly a slipped ring on the piston itself.

While your spark plugs are out, it also makes sense to take a compression test of each cylinder. You can borrow a compression tester from many auto parts stores, and buying one isn't all that expensive, either. Test your compression with all the spark plugs pulled--that will let the engine turn over fastest and will generate the best readings. It's also best--though not always possible--to test the compression when the engine is warm. Expect a cold engine to test 10-15 psi lower than one that's been warmed up.

The compression test will show several things. First, look for consistency across all the cylinders. If one cylinder reads dramatically lower than the others, that's almost certainly where your problem is coming from. It's not particularly likely in this motor, but excessive carbon buildup can also make a cylinder read higher than it should.

If you find a cylinder with a low compression reading--and/or the spark plug has shown that something unique is happening in that cylinder--pour about a tablespoon of motor oil into the cylinder through the spark plug hole and retest. If your compression reading is much higher, then the problem is most likely in the piston rings rather than in the valves or valve guides.

The description of an older bike with highly aromatic blue smoke suggests to me that you may have an oil burning problem. If that's the case, you may be able to temporarily reduce oil consumption by bumping up to a heavier oil. However, some oil will continue to migrate into the combustion chamber until you fix the actual gap or place where the oil is leaking in. Ultimately, with blue smoke, the proper fix requires some engine work.

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1) Is the choke stuck on? Solution: spray carb with WD40 and make sure it moves freely when you pull the choke on and off.
2) are you using the correct 2T oil? It may be that it is pumping too much oil through. TIP: Take out plug and look at colour. if it is brown/tan it is ok. if it is white then there is not enough fuel going in. if it is black and sooty then there is too much fuel (choke stuck on) if it is black and oily wet there is too much oil (adjust the oil pump as per handbook)
3) Could be ready for a decoke. How many miles has it done? Solution: REDEX teaspoon down spark plug hole, turn engine on kickstart with ignition turned OFF. Wait a few mins and start up bike as usual,a few revs should chuck out loads of smoke and clear its guts out.

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hello,seem your valve seal is defect,or you may perform a compression test to determine piston ring is ok,

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Hello!
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Black smoke means fuel runs rich (car getting to much gas). Check fuel pressure/air filter.
In some cases the white smoke means car is burning oil or transmittion fluid. Have tem checked/replaced.
If you can feel a smelly smoke it can be catalytic converter.
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