[Wild Dog]

What you found is a kit for the OHC CG 150 Titan. Around 2011 Honda went from OHV to OHC for the CG150 and the XR 150.
It takes the 150 to 220/229

You can look all over South America and you will never find a 250cc kit for a CG. The max it can go be reliable and run forever is 229cc. They used to sell kits to 250cc but they were just grenades so they stopped making them...
Plus you should be aware that some of kits you will find in South America, are made for racing and will have the life of a racing engine...
There is a 400cc for the Honda XR 250 Tornado, that kit only last 30 hours before you need to rebuild the engine.
Same goes for those 70cc piston kit for the CG 150, they are meant to be abused and rebuild.

This what they use those 70cc kits for


Of course the "230" is not a real world speed, but an "ideal world" test no weight and no air dragging



You want or need a real 250cc? Then you need to look at a new complete engine or another motorcycle.