Craftsman 24hp briggs runs rough

wwb00July 3, 2010

Hi all, Have gone thru alot of posts similar but this maybe different. YTS4000 tractor has only 14 hours on it. just over one year old out of warranty. Loved the smoothness and power of these motors before, but this ones not right. Always felt a bit off but mostly with blades engaged. It just started running rough with stumbles and backfires at governed engine speed, no different fuel or damage noted. model 445677. Checked valves, changed plugs and fuel filter, solenoid clicks on, fuel flow and cap seem ok, but 14 hours??

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remove/clean carb (trash/water/etc.) use carb rebuild kit. let carb soak in carb cleaner overnite. clean all passageways with thin stiff copper wire. blow clean with compressed air.

check all fuel lines for cracked/deteriorated. install/use inline fuel shutoff valve if a fuel gravity feed setup. drain/flush all fuel with fresh.

    Bookmark   July 3, 2010 at 5:38PM
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Well, read my paperwork and there is a warranty for 2 years, but I find authorized service location. Gonna change gas first then follow up on that.

    Bookmark   July 4, 2010 at 7:14PM
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You are correct that engine should be warrantied for 2 years. But, there maybe a pickup and return fee it you can't get it to the dealer. Also, make sure all the filters are clean, plugs are clean, If not they will probably say the rough running maybe contributed to that and that may not be under warranty, thus running up the tab? I know you said 14 hours on the engine, but in extreme conditions warrant a 10 hour check of filters.

    Bookmark   July 5, 2010 at 4:01PM
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Today I drained gas and ran it through my generator which uses a 19hp version of the v-twin, even though that engine is 20 years old I couldn't help but notice how much smoother it ran. I then put a gallon of fresh 93 octane in the tractor, still the same, got to be vacuum leak or broken valve spring or something. Very leery of how warranty work will be handled. Will return to post results, meanwhile the grass still grows!

    Bookmark   July 5, 2010 at 4:29PM
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Well, if anyone is interested, got tractor back yesterday, 3 weeks! And it was....carburetor! Seems ok, we'll see. TTFN

    Bookmark   July 28, 2010 at 8:15AM
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