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Old 04-11-2012, 10:06 PM   #1
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B&S problems


I was gifted an old snapper riding lawn mower. I was told it ran fine when parked minus an oil leak out of the exhaust after it was running. I replaced spark plug, battery etc and got it running. It will run and smoke but dies after it has been running a few minutes. I pulled the carb, cleaned it and re-installed. it is still doing the same thing. any advice?
Model- 288707
Type-0122-02

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Old 04-11-2012, 10:14 PM   #2
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B&S problems


If it's so worn out there's smoke out the exhost most likly the rings and or the valves are shot and it's fowling up the spark plug.

You did dump out the old gas and add fresh gas right?

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Old 04-11-2012, 10:25 PM   #3
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B&S problems


The tank was dry when I got it. I was worried about internal motor problems since I was told it was leaking oil out of the exhuast after it had been running. this is my first attempt at a small engine, I have rebuilt cards/replaced heads etc on my old truck. it blows white smoke when i start it, if it were my truck i would know where to start...
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Old 04-11-2012, 10:31 PM   #4
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If it's white that strange, that would make me think moisture not oil.
Check the plug, it should be clean or brown not black or white.
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Old 04-11-2012, 10:32 PM   #5
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the plug is 2 days old. less than 10 minutes running time on it...
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Old 04-11-2012, 10:33 PM   #6
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B&S problems


its stalling out as if it is getting too much/too little fuel. i thought rebuilding the carb would do it, the float/needle looked good...I did not pull the jets though...
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Old 04-11-2012, 10:36 PM   #7
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That means nothing, if there's so much blow by it's fowling the plug with oil that fast the motors not worth the time to fix it. Only way to find out is to pull the plug.
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Old 04-11-2012, 10:47 PM   #8
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just pulled the plug. its fine
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Old 04-11-2012, 10:53 PM   #9
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B&S problems


Make sure that the air filter is clean and unrestricted, and that the crankcase breather tub is not collapsed or otherwise damaged. The engine needs to breath, and if not doing so as it should, can cause air, along with oil, to be sucked past the rings.
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Old 04-11-2012, 10:58 PM   #10
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the breather tube does look rough, would that cause it to run then die?
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Old 04-12-2012, 09:01 AM   #11
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Not as likely as certain other things, but if it is cracked to the point that dirt and debris may have gotten in there, yes, I would say that it is conceivable that it could be plugged, which could cause the engine to not breath properly, which leads to oil being sucked past the rings, which in turn directly affects the firing. Keep in mind that there is a fair amount of heat there, and they gather oil, dirt, etc., so it's not uncommon that they look a bit worse for wear, but if I were having a run problem, and found that the tube was cracked or torn, it is something that I would definitely correct.

On a separate note, since you said that it runs a while and then stops, check your fuel cap. Does it appear to be original, is it vented, and is the vent clear of debris? A tank with an unvented cap, or with a vent that is restricted, will create a vacuum within the tank, effectively causing the engine to run out of fuel after it runs a bit.

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Last edited by DexterII; 04-12-2012 at 09:03 AM.
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