Briggs & Stratton Briggs Stratton Vanguard V - Twin Vertical Ohv Engine with Electric Start 23 Hp, 1" X 3 5/32" Shaft, ModelNo. 386777 - 0036 - E1 "removing spark plug john deere" Questions

...spark plug wires off, so I examinedthe plugs and one was dirty, one was wet only. I checked for spark with each plug pulled out of its hole, and there IS spark, but when assembled, it backfires and ...