1. Honestly, it can be a few things. CDI could be bad, could have a bad ground connection, bad plug wire (it happened to me!), bad coil, poor jetting, partially clogged main jet, silencer needs repacking or is internally broken (again, happened to me!), or something I can't think of right now.
What have you done to it so far? Clean air filter? Repacked silencer? Fresh and correct plug? If you're in Tucson I'll gladly help you figure it out.
2. Yes, I belong to TRS (Trail Riders of Southern AZ). We are a completely separate club from ATR (Arizona Trail Riders). They are Phoenix based and we are Tucson based. I don't know who would be the person to contact up there but fellow GG forum member AZRickD (
http://www.gasgasrider.org/forum/member.php?u=459) is an ATR member so I suggest contacting him and maybe he can get you hooked up.
Do you do Facebook? If so, you can post on the AMRA Racing group (
https://www.facebook.com/groups/106228189435274/ to sell or place wanted adds. In covers the whole state.