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  1. M

    d140 B&S model 44 popping backfiring thru exhaust

    its a 44r677-1001-g1 plugs are JD and perfect.
  2. M

    d140 B&S model 44 popping backfiring thru exhaust

    Full tune up and valve lash is perfect. It backfires on occasion. Any thoughts?
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