With some minor pe install mods I'm partial to the Chinese 2 cycle on a bicycle. I've worked on everything from a single cylinder to big block V8's, gas and Diesel (own both at this time). These are by far the simplest to work on. Been riding one of my 6 builds since 2009. I don't feel that any one seller has a better kit then any other seller. All are a craps shot, but as I said, with a few inexpensive mods I feel you can get many enjoyable miles out of them.