At a guess I would say your looking at jetmac systems.
If you have a search it has been asked a few time.
There no Honda but services and looked after they are good engines. I also believe Loncin are the engine manufactures of BMW' motorbikes, they are made at Loncin in china and them shipped and installed in Germany.
Also I wouldn't go for anything less than the 13hp tbh else it will just be to underpowered and have to work to hard.
Hope this helps.
Ian