Viking had one engine failure in a CH-701 back in 2017.  A drive part was updated based on this.  Here is the newsletter that was  sent out back then:

Update needed to those that have completed the Viking Flywheel Change
Today a CH-701 made an off airport landing in California due to a failed flywheel drive part. The airplane is damaged but the pilot made the best landing possible and is not hurt.

The batch of parts distributed are therefore recalled and a heavier duty part will be supplied free of charge.
Viking will also update all 130 engines free of charge. Even though there has never been a failure, we do not take any chances.
The part already in use on the 190 hp turbo engine will be used and has considerably testing already completed. It will fit the 110 and 130 engines directly
Anyone that have a part like this picture should contact Alissa@Vikingaircraftengines.com for your free replacement part.

This is the replacement turbo drive plate. It is heavier but many times stronger

Viking will take swift action to rectify the problem with this heavy duty part.