the 150cc kit works fine & w/o much hassle, if that fails just change to orginial 125
the story in China 10000+km after the change & still going strong.

that chinese kit's intro:
125 to 150 kit: includes cylinder, piston, piston rings, piston pin, circlip, mats and ...
This product increase the heat sink (from top maximum size about 15x15cm), larger area of cooling to ensure that the engine for optimal performance.
From original parts, so it's stamped @ 147cm3 [if needs grinding , pls notify)
Bore 62 x stroke 48.8 piston pin diameter 14
Compression height (piston pin hole center to the piston top surface of the distance) 21.2
Thickening of the cylinder pad so that the compression ratio remains unchanged in line with the original.
These are the basic data suitable for the original Suzuki 125 (Bore 57 x Stroke 48.8) TO 150
Modify parts & kit produced for the "Moto Fans World" is with trademark, please look carefully. Quality is equal to or exceed the original BUT "Modify parts" are w/o warranty, think b4 paying.