I bought a motor off eBay for $116. It's cheap and has problems. My advice would be to get a natural colored or silver colored engine, not a black one like I did. The black color on my engine makes it difficult to spot any leaks you might have or get. Right now I have a minor leak originating somewhere above the exhaust port and below the head seal. I'm suspecting I may have a factory defect like a hairline crack or tiny hole in the cylinder case wall but the black finish makes it impossible to see! Just some advice from my current experience lol. As far a kits from bikeberry, they should be fine. They won't be any worse than other kits anyways. I just purchased another cheapo engine kit from gasbike.net. I'm hoping for the best.