It's a matter of mileage, degree and...refinement. Most guys don't ride that much, so the mileage/longevity isn't an issue for everyone. Then there are the types of failures. I've seen a lot of electrical failures w ith Chinese engines, something that virtually doesn't happen with OEM Honda. There have been a number of different issues, with different Chinese motors, over the years...it's beyond confusing, at this late date. I would say that, with vendors like tbolt & dratv selling these things, the fleebay junk is easy to avoid. Having good vendor support makes a huge difference. Still, the possibility of having to scrap an engine, or be stuck for want of some relatively minor part is much greater than with a Honda product. That's a huge advantage of dealing with a major, global, OEM...they have a parts & dealership network. Plus, being able to source virtually every single engine part, for a machine that's older than the median age of human beings is downright amazing...as is the fact that these little Honda singles are the most successful engine family in history. When you get to real road use, things change dramatically. I doubt that you can hurt an L110/125 motor, as long as it's properly tuned (jetting & gearing), oil temps controlled and properly maintained. These engines don't make much horsepower, for their displacement. That said, 5-digit mileage, from a Chinese engine, is the exception, rather than the rule. I've been running the same 110 Honda motor for the past 15 seasons. I've run it wide-open for as long as 30 miles at a stretch. At just a tick shy of 24,000 miles, the valve lash hasn't changed since day one, it still shifts like velvet and, at 50-60mph I can see a clear image in the rearview mirror. The only part I've had to change was the crankshaft oil seal, which began seeping around 17,000 miles. As I said, this isn't for everyone. There's far cheaper horsepower available and the pricetag number captures the attention of most folks. My only point here is that there are differences and you do get what you pay for. It's up to the individual to decide what fits the bill. I mean, if you're getting say, 5,000 miles from a $450 motor and don't mind replacing them at that interval, don't care that much about the smoothness & gear-change quality, cheap-n-chineezy might be for you...especially if you ride less than 500 miles annually. As always, just go in educated, knowing what you're getting. That's not a bow-shot at any product or anyone.