Canyon Country Ultralight Club's plane photos:

Here are the specs for the MX Sprint with a Rotax 477, facts weren’t available for the Original MX. I would suspect the Original flies slower and weighs less.

PowerPlant.........................1 Rotax Model 447
      .................................Twin Cylinder, Two Cycle
      ...........................436.5 cc, 40 hp @ 6500 rpm
      Recommended TBO........................250 hr
      Propeller..............................66 in x 34 in
      Length.................................18 ft 1 in
      Height.................................8 ft 10 in
      Wingspan...............................28 ft 0 in
      Wing area..............................156 sq ft
      Wing loading...........................3.36 lb/sq ft
      Power loading..........................13.12 lb.hp
      Seats..................................1
      Minimum flight crew....................1
      Empty weight...........................250 lb
      Useful load............................275 lb
      Payload w/full fuel....................245 lb
      Max takeoff weight.....................525 lb
      Fuel capacity..........................5 U.S. gal

   PERFORMANCE:
      Takeoff distance, ground roll..........65 ft
      Takeoff distance, 50 ft obst...........200 ft
      Rate of climb..........................900 ft/min
      Max level speed, sea level.............54 mph
      Max operating altitude.................14,000 ft
      Landing distance
           50 ft obstacle (with brake).......200 ft
      Landing distance
          ground roll (with brake)...........60 ft

   CRUISE PERFORMANCE CHART:
   (Speed/Range at sea level with
          4.8 gal. usable fuel)
  @ 55% power(5000 rpm)......................44 mph/84 mi
  @ 65% power(5300 rpm)......................47 mph/84 mi
  @ 75% power(5500 rpm)......................50 mph/80 mi
  @ 100% power(6500 rpm).....................54 mph/52 mi                  

   FUEL FLOW:
      @ 55% power ...........................2.5 gph
      @ 65% power ...........................2.7 gph
      @ 75% power ...........................3.0 gph
      @ 100% power ..........................4.5 gph

   LIMITING AND RECOMMENDED SPEEDS:

      Vx (Best angle of climb)...............33 mph
      Vy (Best rate of climb)................36 mph
      Va (Design maneuvering)................48 mph
      Vne (Never exceed).....................65 mph
      Vs (Stall, power off)..................24 mph
      Landing approach speed.....................
                                (1.3 Vs).....31 mph 

For more photos, see ClubPhotos