The company is using Honda L15-series and Mitsubishi car engines for their conversion to an aircraft application. You may buy them new from Honda but most customers opt for used engines that have been used in cars for less than six months or 5000 miles. After they leave the Viking factory assembly line they can be considered as a rebuilt/new aircraft engine.
The result of this hard work is an engine with the latest technology for the lowest price available. The fuel economy is world class; the power to weight ratio is superb. The quality of the engines is as good as Honda gets it and to ensure reliability, Viking performs dynometer testing combined with thousands of hours of in flight testing.
Honda / Mitsubishi builds these engines in thousands per year (unlike other aircraft engine manufacturers) with enough parts readily available and, more importantly: for a reasonable price. This guarantees the customer benefits from the absolute latest in engine technology for the best price.
As of 2018, Viking Aircraft Engines published on their YouTube channel a number of videos about the technicalities of the Viking engines, below you will find some of these very informative videos:
Video, text and images used with permission of Viking.