Here comes the defenders with that "insurance, layers and liability" argument.

Tell us, when is the last time you have seen any of those three amigo's come into effect with your personal aircraft life, much less your "Experimental Aircraft Experiences"

There are no guarantee's with an Aircraft engine in the first place. There certainly aren't any guarantee's in the experimental market place either so bringing those three into the equation is just the habit from the brain washing days of certified aircraft.

Certainly, you can use a certified engine in an experimental aircraft, you just have to write a larger check is all. There is no data to support that every certified engine will last longer than every non certified engine out there. However, some owners are willing to trade X amount of hours for X+ amounts of $ if needed. Remember, most pilots non Part 135, are cheap SOB's and in proving so, we see everything from a Rotax, Lycoming, Continental, Subaru, VW, Yamaha, Suzuki, Mazda, to a Chevrolet being installed into these planes in order to fit the budget of the builder/owner.

If the Yamaha will last only 1,000 hrs vs 1,500 for certified and only cost 4k vs 20+K then it's a no brainer as to what people will want to do with their buying power. Let's not forget that most certified engines are top'd at 1,000 hrs so really none of these are going to last for ever and none are ever going to be cheap enough in some's eyes.