Stock XR100 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.

 
·          Rule #1: If it doesn’t say you CAN do it, then you CANNOT!
·         Motorcycle must be a Honda XR100/CRF100F production year 1981 to present.        
·         Stock OEM exhaust must be used. Baffle may not be removed. Spark arrestor screen not required.
·         Stock OEM airbox, complete and intact, must be used
·         Stock OEM airfilter or aftermarket direct replacement part. Must fit in stock location with NO modification.
·         Stock OEM carb must be used. Jets/needle may be changed
·         OEM piston must be used in standard, .25 over, or .50 over sizes
·         Bore cannot exceed .50 over
·         Clutch plates and springs may be changed
·         Shift lever may be changed
·         Clutch lever and front brake lever may be changed
·         Handlebars may be changed. Drop/clubman-style bars may not be used. Clip-ons may not be used
·         Grips may be changed
·         OEM handguards may be removed. Aftermarket barkbusters/handguards may be added
·         Brake cable and clutch cable may be changed
·         Spark plug may be changed
·         Front rim may be changed to 16” OEM XR80 front rim
·         Stock OEM rear XR100 rim must be used
·         Any tires may be used
·         Stock OEM Front forks, Internals may be changed.
·         Stock OEM rear shock, spring may be changed.
·          Front and rear sprockets may be changed. Must run OEM sized chain.