Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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Blowing flames

I have the exhaust pipe off and when I start it,and let it run it will blow out flames thru the exhaust hole. Also do you adjust the valves on the exhaust stroke or the intake stroke at TDC?

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  • Carleton Kidder
    Carleton Kidder Mar 24, 2014

    this is a craftmans LT1000 18.5HP

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Hello Carleton, Fire out of the exhaust port with no pipe is normal. You want to bring the piston to top dead center on the compression stroke. Both valves should be fully closed.

Posted on Mar 24, 2014

Testimonial: "ok if I have the muffler on it is backfiring thru the exhaust and the carb. I have the valve adjust on the compression stroke and set the valve at .004. Ty"

  • Carleton Kidder
    Carleton Kidder Mar 24, 2014

    The exhaust pipe gets red also. I have cleaned the carb With carb dip and spray. I was think it might be getting to much fuel? and think the carb might need to be rebuilt. What do you think?

  • Dwight Beard Apr 05, 2014

    .004" seems to close. .008" intake and .010" exhaust would be better. Maybe even find the exact clearance specs. I think you should also pull off the flywheel to check the aluminum key to make sure it hasn't partially sheared, causing late ignition timing.

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