Last year I contemplated doing this as well, getting an EC/MC 125 leftover and building a 144. After doing a lot of research, and talking to a few guys who did other 125s, I decided to forget about it. Concensus was that while some work good, many are prone to reliability problems. Now, perhaps a lot has to do with the builder and how the cylinder is ported, but overall there was a pattern of more problems. The GasGas 125 is very sturdy so perhaps its a better platform for this mod, but the bikes are so scarce there is no history. Just pick up a used 125 of any brand to see if you can get along with the power first, then sell it for what you paid. Also try a 250F.
GasGas, who did your bike? FWIW, some have been happy with EG, others very disappointed.
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