Hi Paul,

Here is the info on the 100 hour on the aixro from the dealer in the US,
RENNTECH.

Marc Joseph

Developed as a response to increasing environmental regulations in
Europe and North America, the XR50 puts out a fraction of the harmful
emissions produced by conventional engines. Despite its low emissions,
the Wankel 4 cycle rotary motor delivers all the power of a thoroughbred
racing motor.

While the *RENN*TECH /Aixro XR50 delivers over 48 hp and 34 lb-ft of
torque, the incredibly efficient design keeps the engine's weight to 32
lbs.; a power-to-weight ratio unmatched in kart racing.

Driving a kart powered by the XR50 engine is, is  itself, a unique
experience. Besides the tremendous power to weight ratio of the motor,
the XR50's eccentric shaft and rotor design (based on the original
Wankel patents) virtually eliminate engine vibration, dramatically
reducing material fatigue and part failures common to reciprocating
engines. Along with other features engineered into the Aixro, this
smoothness works to provide long engine life, delivering well over 100
racing hours between service.

XR50 engine pkg starts at 5450 USD. CLICK HERE
<http://www.renntechkarting.com/tour_xr50.html> to tour the XR50.