I have a grip. but you exaggerated a bit. repeatedly abusing your bike and using it for something it wasnt intended will hurt your engine, yes. But doing some wheelies during regular riding will more than likely, like gunther said, have the same negative impact that doing such things as revving a cold engine or neglecting to change oil or brake pads, etc.
again, im talking about the engine, i already explained the effect wheelies can have on every other aspect of a bike. its the stress of the impact of comming down that does the most short term damage.
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