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18.5 Intek OHV Briggs-DLT3000 Craftsman - Won't start - backfires

18.5 Intek OHV Briggs - DLT 3000 Craftsman (Model # 917.275821 SN # 071905c001284) - I bought it in 2005 and it has never failed. I was mowing yesterday and I turned it off to close a gate. I got back on it and it wouldn't start - just backfired as I was trying to start. I disconnected the fuel line into the carb and it was pumping fuel out. I checked for spark on end of plug and it was jumping to the frame. I looked to make sure the flywheel key was not sheered - it is all fine. I sprayed quick start in the opening to the carb and it wouldn't even begin to fire. It feels like it is getting compression when I manually turn it. I am at a loss at what to try next. Anyone?

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  • skylarsdad Oct 04, 2009

    I replaced the seat switch, but found out that the mower will turn over with or without the seat switch even plugged in. This used to not be the case because my son would need my help to start it because he was too short to reach the pedal and still sit on the seat so I would hold the pedal in while he sat and turned the key. It is definitley electrical, but not the switch itself. Any suggestions. Thanks in advance.

  • Brian Snoddy Apr 01, 2012

    I am having the exact some problem with mine. I had it running and then turned it off next day wouldn't start. Like you I checked the gas, spart, flywheel all fine. Did you find out what the issue was?

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These guys are all wrong. Remove the valve cover and inspect the two pushrods, one (exhaust most likely) may have come off the rocker arm or is bent or even snapped.

Posted on Nov 21, 2013

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Pull the flywheel off and I think you'll find the keyway is sheered. Looking down from the top it looks as though it is not sheered but more than likely it is. Quick enough way to know for sure.

Posted on Mar 03, 2013

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I have the exact same problem. It was running fine then next time i went to start it it wouldnt start. I checked the fuel, spart, flywheel all are fine. Did you find the issue with yours?

Posted on Apr 01, 2012

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Check the switch under the seat.

Posted on Oct 03, 2009

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