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Unread 06-04-2010, 06:30 AM
 
1,492 posts, read 3,932,636 times
Reputation: 1246
Default Lawn mower has black smoke coming from exhaust

It's a walmart lawnmower, I'm using gas from last year.... It will crank but then stop.

is it the gas quality? Should I drain it and use new gas or go to mid or high grade gas?

Are you supposed to mix oil with the gas like the old mopeds?

Thanks!
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Unread 06-04-2010, 06:35 AM
 
Location: Seaford, Delaware
3,320 posts, read 8,789,065 times
Reputation: 2119
Old gas may be the problem. Gas will not keep anymore because of the additives now added. Change the gas and try again.
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Unread 06-04-2010, 06:54 AM
 
Location: Georgia
282 posts, read 720,849 times
Reputation: 222
I had this issue-have you check the spark plug and filter?
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Unread 06-04-2010, 07:13 AM
 
Location: Visitation between Wal-Mart & Home Depot
8,310 posts, read 18,634,494 times
Reputation: 6554
Quote:
Originally Posted by VegasGrace View Post
It's a walmart lawnmower, I'm using gas from last year.... It will crank but then stop.

is it the gas quality? Should I drain it and use new gas or go to mid or high grade gas?

Are you supposed to mix oil with the gas like the old mopeds?

Thanks!
Drain the tank, give it new gas and change the oil. My mower will belch a little black smoke when it wants an oil change, but if the gas (especially ethanol gas) has been sitting for a while that may be the problem. If the mower was "shelved" with a full tank and the gas has evaporated out you may have some varnish problems or sediment in the fuel line.

Anyway, draining the gas, replacing it and changing the oil is probably going to get you up and running.
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Unread 06-04-2010, 07:35 AM
 
Location: Jacksonville, FL
3,392 posts, read 2,505,627 times
Reputation: 2050
Your mower needs a tune-up. Change (or at least clean) the spark plug, get a new air filter, change the oil, and get new gas. Last year's gas will kill your lawn mower faster than anything.

Never mix 2-stroke oil in your lawn mower gas. Rule of thumb for small engines, if it has an engine oil reservoir, you don't have to mix oil and gas for the gas tank.
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Unread 06-04-2010, 09:36 AM
 
Location: I think my user name clarifies that.
8,296 posts, read 12,461,017 times
Reputation: 3612
Quote:
Originally Posted by VegasGrace View Post
It's a walmart lawnmower, I'm using gas from last year.... It will crank but then stop.

is it the gas quality? Should I drain it and use new gas or go to mid or high grade gas?

Are you supposed to mix oil with the gas like the old mopeds?

Thanks!
First, drain your old gas. Then fill the tank with fresh gas. Do NOT put oil in the gas.

Second, it could be that the butterfly on your carb is sticking shut, and essentially flooding the engine. That might be due to where you have the throttle positioned, or it could be gummed up.

But definitely go with new gas. Hopefully that'll do the trick.
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Unread 06-04-2010, 10:33 AM
 
513 posts, read 575,256 times
Reputation: 262
It's 'probably' MIB disguised as John Locke!!!
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Unread 06-04-2010, 10:55 AM
 
Location: NJ
1,360 posts, read 2,932,955 times
Reputation: 628
Old gas is bad? I'm using leftover gas from last year and my mower is working just fine.
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Unread 06-04-2010, 11:14 AM
 
Location: The Raider Nation._ Our band kicks brass
1,856 posts, read 5,267,455 times
Reputation: 2114
Quote:
Originally Posted by ansky View Post
Old gas is bad? I'm using leftover gas from last year and my mower is working just fine.
That depends on where you live. Out West most gas has an ethanol blend. It won't last because it absorbs water, and gums up the carburetor.

In the East it is still very common to get straight gas. I quit buying gas at Wal-Mart when they went to ethanol.

Black smoke indicates that it is running rich. Blue smoke is burning oil.

I would drain the old gas, clean the plug, and give it a shot. If it still doesn't run right, a few drops of Sea Foam will clean it out. One bottle will treat 20 gallons, so only use a few drops in a mower.
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Unread 06-04-2010, 11:19 AM
 
Location: Seaford, Delaware
3,320 posts, read 8,789,065 times
Reputation: 2119
If it's in a sealed gas can it probably will store OK. The problem is in a mower or other gas powered tool, the tank is not sealed and evaporation happens and the gas is no longer good. It used to be you could leave the gas in a mower, but with ethanol and other additives now added, you cannot let it sit over the winter.
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