i haven't heard of many crank bearings going out i would say check the timing chain/tensioner the valves would make alittle noise but not a whole lot as far as the smoking goes bad rings/ scared cylinder
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-Honda Rancher 350-
-Wiseco Piston-
-Kenda Executioners-
-Super ATV Disc Brake Kit-
-Uni Fliter-
-DPK Clutch Kit-
-Custom Snorkel-
-Jets-R-Us Jet Kit-
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