Yamahas primarily. The GasGas 125 motor is VERY similar to a '98 - '00 era YZ125. You can use a YZ125 piston kit. Since the GasGas 125 cylinder is scarce and VERY expensive, I decided not to bother in case the project was a failure. Plus, the bike was still quite expensive for a leftover. After riding a couple 250Fs and really liking them, I decided that if I downsize that is the route I will take.
The Husky 125 is more established and I suspect more parts are on hand. While I had no major problem getting GG 125 parts, you will never find them in stock. Most of the consumables though cross over to either a YZ or CR 125, and the rest is shared with the bigger GGs.
This is all based on research talking to people who have done it, as I never have, but like Skidad said there are some real horror stories about EG quality and support from reliable sources.
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