Here's a 144 kit.
http://2tracing.it/ricambi-gas-gas/e...lindro-144-cc/
"Complete cylinder kit 144 cc for Gas Gas EC 125 from 2013 to 2015.
The kit includes the full cylinder exhaust valves, head, piston, cylinder seals series, prisoners etc.
Mounts correctly on Gas Gas EC 125 models 2013 version and ensures an increase in power in the order of + 5 hp !!
Possibility of installation in previous versions (2003-2011) with the addition of a small change (please contact us Please for details)."