Just a China factory like all the rest of them..........
All of my engines came from BGF and I have had good results with them had one failure but I think it was my fault being a noob at the time and mixed the fuel wrong for the type oil I had and then run it wide open for several miles and siezed it.......
The other three engine are very good run-ers.
I wouldn't be afraid of that engine at all...... but to each there own and we must all remember that these china made engines are always a crap shoot to some extent in my opinion, it can be a great little engine or it can be a lemon reguardless of the "Brand" or factory where it was thrown together.
I have 2 of the big mount engines and be aware that even though they will fit the frame tube, they may still sit to low to clear the chain guard on the bike and/or the sprocket if it is a 44T sprocket that is on the peddles.
I solved this problem by putting a 36T chain ring/sprocket on my peddles and chunking the guard which isnt needed anyway in my opinion, these 36T sprocket can be bought on ebay or other sites that carry bike parts for around $10 and they are easy to put on, now I'm speaking of a single speed cruiser bike like a Huffy beach cruiser or simular bikes.
If you do this mod on the Huffy type single speed cruiser you will be able to sit that engine right down and it will saddle both front and rear tubs nice for a good solid mount.
Peace
Here is the product
Chrome 80CC motor bicycle engine KIT motorized bike K80 | eBay
It has a big mount so you can mount directly to over-sized cruiser tube without the adapter.
Does anyone know what factor these motors come from? Thanks everyone