Be aware that this list is for the United States, there is no way I could cover the entire world. But in the world of global manufacturing, if it is being recalled in one country there is a good chance it is under recall in others.
If you are US based use the NHTSA website http://www.safercar.gov. Enter your VIN number to see if your motorcycle is affected by the recall.
If you are based in Europe use the Safety Gate website to locate recalls that may impact you.
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Manufacturer: Ducati.
SUMMARY: Ducati is recalling certain 2018 & 2019 Panigale V4, V4 S and V4 SP motorcycles. The oil cooler output port may crack causing an oil leak.
1,663 of certain 2018-2019 Ducati Panigale V4, V4 S, and V4 SP motorcycles triggered because the oil cooler output port may crack, causing an oil leak, which could increase the risk of a crash.
CONSEQUENCE: If the oil cooler output port cracks the resulting oil leak could increase the risk of a crash.
REMEDY: Ducati will notify owners, and dealers will replace the oil cooler, free of charge. The recall is expected to begin January 24, 2019. Owners may contact Ducati customer service at 1-888-391-5446.
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Manufacturer: Harley Davidson
SUMMARY: Harley Davidson is recalling Street 750 and Street 500 models manufactured in the U.S. and India from May 19, 2015, through Dec. 6, 2018 due to brake caliper problems.
CONSEQUENCE: The issue is that brakes might drag because of brake caliper piston bore corrosion. If left undetected, the increased drag could increase the risk of a crash.
REMEDY: Harley Davidson will notify owners, and dealers will repair the problem free of charge. Owners may contact Harley Davidson customer service at 1-800-258-2464.
I JUST WANT 2 RIDE!! 
[…] The world is getting warmer, the polar ice caps are melting and we are wiping out thousands of species per year. One of the biggest contributors to global warming is fossil fuel that powers our vehicles. Motorcycles manufacturers are now going electric not only to save mother earth but also to stay in business as consumers are becoming more and more aware of their impact on the environment. Even Harley Davidson is betting their future on their electric motorcycle line LiveWire amid low earnings, lack of interest from millennials and recalls. […]