Question about Briggs Stratton H7159 & Stratton® 5500, 10 HP Generator

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My 7.75 Hp snowblower starts, runs 15 minutes, then stops.

It will restart, but quits under load. Have changed the plug, pulled and cleaned the carb and fuel line to tank, made sure the kill switch was not grounded. After quitting, upon restart it will idle very rough with full choke, then suddenly take off again. The governor is working. I thought perhaps the gas cap was not breathing and the tank was going into vacuum, not so.. No points or condenser, just Briggs magneto. Is the ignition getting hot and has bad windings?

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  • rmyoder Feb 05, 2014

    I just had the same problem with my 3hp briggs snow thrower (from 1978). I had just replaced the plug with the correct RJ19LM equivalent (Champ EZ Start), so I did not expect this to be the problem. However, I installed the Champ CJ8 that a previous owner had used and it ran perfectly. Apparently the RJ19LM was too hot, which then overheated the coil, etc. (?) This suggests the plug was too hot for the engine, even though the user manual specs this plug. Either way, my problem was solved by using a CJ8.

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Check your eingine compression, sounds like it is worn hence the rough idle and loss of power under load

Posted on Feb 16, 2009

  • 4jerryp Sep 04, 2011

    This sounds more like the coil warming up and shutting down. Let it cool a while (1/2 hour outside in winter) and it should run OK until the coil heats up again. If so, it is likely the coil.
    A warn engine should still run, since it started and ran OK for 15 minutes.

  • rmyoder Feb 05, 2014

    I just had the same problem with my 3hp briggs snow thrower (from 1978). I had just replaced the plug with the correct RJ19LM equivalent (Champ EZ Start), so I did not expect this to be the problem. However, I installed the Champ CJ8 that a previous owner had used and it ran perfectly. Apparently the RJ19LM was too hot, which then overheated the coil, etc. (?) This suggests the plug was too hot for the engine, even though the user manual specs this plug. Either way, my problem was solved by using a CJ8.

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