Here is what Barnett said when I emailed them....
While we do not have any known problems with this clutch kit, we would be happy
to inspect and replace the clutch as needed. Just send the clutch plates and
springs to us and be sure to include your name, address, and note explaining
what has happened. With it only lasting two hours, it sounds like it could have
been caused by a stack height that was to thin- possibly even due in part from
a worn pressure plate and/or clutch boss (inner hub). If your clutch boss or
pressure plate is worn, it can cause a new clutch to burn up fast. The clutch
plates burning up shouldn't cause any unusual wear on the clutch basket.
Chris Taylor
Barnett Tool & Eng.
2238 Palma Dr.
Ventura, CA 93003