Warranties are provided by the manufacturer, not the dealer or the distributor. No one cares until there's a problem. Having been on both sides of the fence I can say that if you have a legitimate problem it will be attended to. If you're just blowing smoke up someone's backside ( issues related to non OEM parts for instance) you'll be told to take a hike.
As a 'for instance', several years ago I had a contract gig working the customer service line for one of the Japanese importers. Buddy calls up complaining that his ATV has worn out suspension and drive line components prematurely, as well is perpetually smoking belts. Unbeknownst to him, the dealer had already called me to give me a heads up.
I ask him, does it have a lift kit, oversize wheels, deep water kit, winch and snow plough ? He says yes. I ask him why the repairs would be warranty related when the machine itself is not defective but suffering from problems created by all the add-ons ? He hangs up after yelling for about 5 minutes.
Same rules for motos - manufacturers warranty covers original equipment, not problems created by add on parts or modifications.
Wingboy - have you had any personal issues or are you just making a blanket statement ?