This sounds like typical Chinese bike hater. Let me tell you I have a Sunl 175-A and it has been sound as a rock. I've been riding Japanese bikes (Honda, Suzuki, Yamaha, and Kawasaki) since I was a young kid. As a matter of fact I still own two Kawasaki MX bikes. This Sunl that I have has been every bit as good as any Japanese bike I've owned. I honestly have not had one problem with it. I did break a fool guard (my fault for trying to get over a huge log, lol) and the replacement part was simply and quick to get. Straight from Sunl online it took only a couple of weeks to get here and was pretty inexpensive too. I love my Sunl and have never even had to use the kick start as it always fires up first bump of the electric starter.
My advise to others. They are good machines and you can't beat the price. I could replace the entire engine with the auto transmission for $500.00 if I had to. Try to do that with a Japanese bike. I've had lots of problems with my Japanese bikes over the years but don't hate them. Don't be in such a hurry to be a hater. Look at Toyota's problems now. Still damn fine cars. Take any advise with a grain of salt. There's always two sides to a story.