"The Cninese made engine is only a clone because it "looks" like the Japansese engine. It could use the best performing oil to make up for the inferior machining and metallurgy."
Yeah.....
That's why Honda, Harley Davidson, Briggs & Stratton and numerous other small engine manufacturers have their products or components for their products made in China.
Have to say, your above comment may have applied ten years ago but it's no longer the case.
Chinese made engines such as Kipor, Champion, Lifan, and LCT marketed in North America are, good engines. Particularly for their price.
I speak from experience. I own two Chinese built engines (that I'm aware of). A Chinese built Mitsubishi that I've owned for six years and a Champion that I bought last year. I couldn't be more pleased with them.
Go to some of the go-kart racing forums and see what they have to say about the Chinese clones. If an engine is going to be abused, that's where it will happen. You've got a lot of kids with little mechanical experience, running their clone engines wide open at rpms higher than OPE and not giving them the greatest of maintenance. They love them because they're inexpensive, make good power and are durable.