Connecting rod made in  Japan, set upgrade Thai racing workshop. Compatible with 2004-2018 year Set of: Connecting rod made in Japan. (Long or Tenki type) Connecting rod special eccentric pin made in Japan Connecting rod split special bearing made in Japan Cylinder lifting aluminium panel 3 mm., product Honda workshop Thailand Cylinder base gasket 2 pcs. made in Honda Thailand Special 92 section longer chain valve made in Honda Thailand Torque effect: Pin eccentric 3 mm from midline. Connecting rod bottom pin rotate outside circle. Honda CBR 125 engine default stroke 47.2 mm.  Outside 3 mm, then top + 3 mm, bottom + 3 mm, total stroke + 6 mm = 53.2 mm. Engine new bore/stroke caracter 58x53.2 mm. This only torque tuning. Engine RPM not higher! Lower about - 200 RPM/min, but plus torque 18% all RPM range. Engine new capacity 141 ccm. Plus 18% power join forces: +11 % from egnine bigger capacity (ccm), and +7% from higher compression. This kit allow 95 octane fuel. Not necessary set-up CDI or PGMFI-UNIT After fit conrod 6th gear not only economy, get power to bigger speed. Install info: In kit neccessary 3 mm thick aluminium panel, compensation connecting rod plus length from standard. Please engineer install in workshop. :-) Lifetime technical assistance from honda-cbr-125.com