It depends on the quad/motor.....The occasional wheelie session won't hurt it though, but there are certain vehicles that can get starved of oil if the front end is verticle for too long. I unfortunately do not know a lot about the issue, but I do know that streetbike stunters sometimes do oil system modifications to their bikes (certain models are more problematic than others).

Sorry I couldn't be of much help....bottom line is I doubt you'll hurt anything doing the occasional wheelie.

 

rivermud: What you say about side to side makes more sense than fore and aft. It's a good feature if it is side to side I would say.