I was told they are done at a-main. Nice since I do own 4 go-tec's and 2 mg's. The mg-66's are not a problem. answer rc.com sells them and the parts. Along with the a-main fuel. As far as go-tec there are a few dealers on here. We should figure out a way to get a list going on who is a dealer here in the states. And make it a sticky some how. Trey has been saying he will have it on the go web site,still not there. So all Go dealers lets get a list and addresses to get in touch with you going. Also if you need a part or engine just ask here you will have a response in no time flat. I needed some o-rings a few weeks back ended up with enough to do at least 8 engines. Lets just remember for Trey it is a big task getting the product and distribution setup and running. I remember not to long back if you were looking for a go engine part here in the usa you wouldn't even get a response. So now at least you will.