Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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I have Craftsman lt2000 with 18hp ohv engine...runs perfect until hot. It then will sputter as if running low on fuel or losing spark.have replaced fuel filter , changed the spark plug, changed oil/filter, and the air filter. is there a coil that may be cracked? or is it possible something more serious like a cracked head/intake, that is expanding when hot?

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Posted on Aug 22, 2010

  • jerbanta Aug 22, 2010

    no, just the Briggs 18hp ohv


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Sounds like coil my be braking down

Posted on Jul 10, 2014

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18 HP OHV Vapor locks or real warm day after working 30 min or so.
is the air movement correct under the hood? Newer models have a plastic shield on the hood to direct cooling air for engine. Is this known to help my problem?

Posted on Aug 15, 2012

  • Gene R Steere Aug 16, 2012

    18 HP OHV Vapor locks on real warm day after working 30 min or so.
    is the air movement correct under the hood? Newer models have a plastic shield under the hood to direct cooling air for engine. Is this known to help my problem? I have hydro-stat so I run high speed when mulching.


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Why is my craftsman running rough?

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I realize you have a 10 Hp Briggs engine. The symtom your describing is often caused by the valve lash gap being to narrow on the EXHAUST valve. You may have a 0.001 gap cold but when it warms up that gap is less and you get just a bit of compression blow by but not enough to impede power output. Over time it will usually get harder and harder to start. The remedy is to reset the valve tappet gap
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Non OHV engines L-head are adjusted .004 intake and .006 Exhaust at TDC by changing valve stem length with a grinder or replacing the valve if necessary.

If you still have the problem after doing the above... replace the spark Plug... (again even if yours is new) After spark plug replacement you still have the problem respond here and I will help you until this is resolved.

This could also be a case of the fuel mixture just a tad lean..

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