I don't think anyone will protest your first race if you don't have it... BUT the rule book states you need it. OMRL rule book. Stock XR100 This class is designed to provide an easy, low cost way to participate in Ohio Mini Road Racing League. 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 any 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. Clipons 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.● No oxygenated race fuel allowed● Aftermarket / Custom trimmed plastics are permitted