Question about Toro 89885 "lawnboy" Premium 4cycle Oil 20oz

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My lawn mower starts, runs for about 5 seconds and then dies. I need to prime it in order for it to start. It will keep running if I continually keep priming it. I have bought new gasoline, changed the oil and changed the spark plug and the same problem continues.

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The engine is starving for fuel, that is why it will keep running while you force the fuel to the engine with the primer button. At this point, the carb will have to be removed,disassembled and cleaned. I'm sure you will find blockage and dirt in the carb and also in the small orifices for air and fuel flow.

Posted on May 31, 2010

  • paul_bachand Oct 12, 2010

    Thank you for your help. I was able to fix the problem without pulling the carb apart. I took off the air filter and poured some fuel down it. I got very lucky

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You need to find the main jet and run a fine piece of sturdy wire through it. That will restore fuel flow so your mower can continue running after the priming fuel is gone.

This is a good thing to learn. Main jets tend to clog a lot on mowers these days.

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