Which engine?

[Gramigno]

Hi.
I'm learning about Chinese bikes and I have many questions,


I'm locking for a 250cc, 4 strokes, chain timed ohc, single cylinder, carburetor fitted , possibly with balancing shaft, which I don't know the name for English, it's a secondary shaft that rotates in the opposite direction of the main shaft and helps diminishing the vibrations of the engine.


I would like it to be 250 because I'm an heavy fat 300pounds guy, I prefer it with carburetor cause it's more simple to adjust and repair than an EFI circuit for a normal non professional person, and I wrote on the Enduro section cause I think the only real work oriented .motorbike must be able to overcame every road condition, flooding included and if I properly understood in Panama rains very often and very violently and I can imagine sometimes the road will be a 1 foot deep river and I still will need to go through to make my delivery.





My first question is if you know if such engine exist and if it exists, in your experience which one is the most reliable?


Reading here I found out Jincheng and Zongshen are good manufactures but I'm sure you know this topic way better than I do!


Thank you very much for any answer


Cheers!