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Common 4 Stroke Problems:             Won't Start   X   X   X   X   X     Hard to Start   X   X   X   X   X     Kick's Back When Starting                   X     Starts But Dies Right Away       X                 Runs But Dies When Hot   X   X                 Runs Rough At Idle   X   X                 Runs Rough Under A Load   X   X                 Engine Smokes (White/Gray)       X   X             Engine Smokes (Black)   X   X                 Engine Surges   X   X               X Runs Too Fast       X               X Runs Too Slow       X               X Lacks Power   X   X   X   X   X   X Backfires Through Carb               X   X     Backfires Through Exhaust   X   X                 Leaks Fuel       X                 Uses Excessive Fuel   X   X                 Has Fuel In Crankcase       X                 Loud Pop When Engine Dies   X   X                 Leaks Oil       X                 Uses Excessive Oil       X   X                                       Other Problems:                         Loud Squealing Noise                         Excessive Vibration