RG500 Gamma custom by Sincritereo Works of Spain

Handmade engine, 130hp and weighs only 160kg. Fun. Couldn't find the makers website, here's where I found it: 
http://super7moto.com/directorio/index.php/el-rincon-grasiento/1098-rg-500-gamma-34.html?showall=&limitstart=

DETAILS (google translated)

CHASSIS

Removable subframe with drawer under the seat and footrest brackets.
Support as headlights and fairings.
Support steering damper anchored to the chassis as.
Tilting widened and strengthened.
Weight 160kg
MOTOR

500cc 2 stroke 4 cylinder box 2 heights. (130hp approx.)
Intake valves by rotating the crankcase.
Food, 4 new 34mm Mikuni carburetors (originally mounted 28mm)
Pistons, rings, cages, seals bolts, rotary valves, etc ... new
Walls made CNC rotary valves
Crankshafts and remade box changes.
Cylinder heads flattened. Squish matched. Oil Pump canceled.
Cylinders handmade, all open transfers and the steeper ramps.