I don't see any feasible way to "blow" your motor by shifting without the clutch. Even if you manage to totally fubar the transmission, nothing is going to affect the actual working parts of the engine. That's purely a coincidence. I don't even know how you could break off a gear shifting without the clutch, unless you, through some lack of intelligence, were doing this with the throttle still open.
And racers don't replace their gears all the time, to whoever said that. I know guys that race and never replaced a piece of the transmission yet. Sure, you get to the national pro level, and some of those guys practically replace their entire quad every race. Know why? Their sponsor pays for it, and their logic is that replacing anything that can fail after every race reduces the chances of a breakdown. Know how many racers actually run on a national pro level, and actually do that? Not even a blip on the radar compared to how many of us shift without the clutch every day and never replace a single piece.
The only time I ever heard of racers breaking gears is when they do throttle-on landings. That's landing a jump with the throttle pinned, so they get a boost of speed when they hit the ground. Even when they break a gear doing that, it's usually because they came up short on a jump, cased it, and basically stopped the engine dead from 10,000 rpm.
And racers don't replace their gears all the time, to whoever said that. I know guys that race and never replaced a piece of the transmission yet. Sure, you get to the national pro level, and some of those guys practically replace their entire quad every race. Know why? Their sponsor pays for it, and their logic is that replacing anything that can fail after every race reduces the chances of a breakdown. Know how many racers actually run on a national pro level, and actually do that? Not even a blip on the radar compared to how many of us shift without the clutch every day and never replace a single piece.
The only time I ever heard of racers breaking gears is when they do throttle-on landings. That's landing a jump with the throttle pinned, so they get a boost of speed when they hit the ground. Even when they break a gear doing that, it's usually because they came up short on a jump, cased it, and basically stopped the engine dead from 10,000 rpm.