Stock GP

2017

StockGP is designed to provide an easy, low cost way to participate in mini roadracing. Minimal modifications ensure close racing and showcase rider talent, not mechanical skills or machinery.  

Honda NSR50 or NSF100, Kayo125

  • Stock OEM Engine must be used. No modification allowed
  • Stock OEM Exhaust must be used. No modification allowed
  • Stock OEM Forks must be used.  May change springs, fluid, valving
  • Stock OEM Shock must be used.  May change spring
  • Stock OEM carburetor must be used. Jets/needle may be changed
  • Stock OEM Piston must be used in standard size or maintenance overbore sizes
  • Stock OEM Brakes must be used, may change pads.
  • Stock OEM ignition and electronics must be used
  • Cylinder maintenance overbore +2cc to OEM cylinder
  • Clutch plates and springs may be changed
  • Controls may be changed
  • Spark plug may be changed
  • Front and rear sprockets may be changed. Must run OEM sized chain
  • Any bodywork may be used
  • No oxygenated race fuels or additives allowed

Yamaha YSR50

  • Stock OEM Engine must be used. Unlimited modifications to engine allowed.
  • Engine size must not exceed 62cc
  • Unlimited modification to frame
  • Unlimited modification to suspension.
  • Unlimited modification to braking system.
  • Unlimited modifications to exhaust with sufficient silencer.
  • Unlimited modification to carburetor.
  • Unlimited modifications to ignition and electronics
  • Front and rear sprockets may be changed. Must run OEM sized chain
  • Any bodywork may be used
  • No Oxygenated Racing Fuels