As a specialist in breaking pig-iron kickstands on an overloaded Red Rocinante, 30 mph wind gusts hitting the bulky windshield on a parked recumbent Rucio, my bikes have tipped over at least 50 times....the handlebars hit first, and luckily I haven't broken but one mirror.
If you "tip over" at 30 mph, engine damage is the least of your worries.