Yeah, I remember the XL. Both Avid Aircraft and Kitfox were attempting to "Go back to the future" with inexpensive, lightweight 503 powered versions of their Model 4's.

Unfortunately neither the Avid Bandit or the Kitfox XL ever really went anywhere success-wise, as most that priced them out just decided to spend a bit more and get the regular Model 4, or Mark 4.

I think Larry is right in thinking the XL was essentially just a remade Model 4-1050. They were drastically trying to get the empty weight down so it would fly well with the less expensive, but lower powered Rotax 503. So in my opinion, I believe the gross weight being derated from 1050 to 950 was only due to the lower powered engine not being able to handle the higher gross weight as well.

However, I'm pretty certain that at the time if you called Kitfox and asked them if it was ok to up the gross on your XL to 1050, they would probably agree as long as you were using a 582 vs a 503.