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    Sean172's Avatar
    Sean172 Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Aug 5, 2007, 08:34 AM
    B&S 13.5 OHV backfiring through carb, no power
    I have a 13.5 hp Briggs & Stratton riding mower, it lost almost power and backfires fiercely through the carb at any rev above an idle. I have already replace the head, flywheel key, cleaned out the carb and bypassed the fuel filter. It may have overheated due to a mouse nest found under the cowl. I have a new magneto/coil on order.
    What can I do!! :mad:
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
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    #2

    Aug 5, 2007, 12:01 PM
    Check The Valves.
    Sean172's Avatar
    Sean172 Posts: 6, Reputation: 1
    New Member
    		  
    #3

    Aug 5, 2007, 01:15 PM
    Valves themselves are new with the new head, they are adjusted according to the manual.
    wutafuta's Avatar
    wutafuta Posts: 32, Reputation: 1
    Junior Member
    		  
    #4

    Aug 6, 2007, 01:32 PM
    What clearance do you have the valves set? I know you said according to the manual... but I have found a manual to wrong in the past.
    Sean172's Avatar
    Sean172 Posts: 6, Reputation: 1
    New Member
    		  
    #5

    Aug 6, 2007, 02:45 PM
    The book says .004 to .006 , I think I used .005, is that correct?
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
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    #6

    Aug 8, 2007, 04:41 PM
    Yes, The Reason For Using .005 Is To Stay Within The Tolerance Range .
    .004 To .006 Is The Tolerance Range. Therefore, 005 Is Great!
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