▁and ▁also ▁adapted ▁to ▁drag b ikes ▁that ▁used ▁p neum at ics ▁or ▁hyd ra ul ics ▁to ▁actu ate ▁the ▁cl utch ▁release , ▁or ▁cent rif ug al ▁drag bi ke ▁cl ut ches ▁known ▁as ▁" slider ▁cl ut ches " ▁that ▁eng age ▁with ▁the ▁engine ' s ▁revolution s ▁per ▁minute ▁( R PM ) ▁increase . ▁When ▁using ▁a ▁delay ▁box ▁on ▁a ▁motor cycle ▁with ▁a ▁slider ▁cl utch , ▁the ▁engine ▁R PM ▁is ▁electron ically ▁controlled ▁( c apped ) ▁by ▁an ▁electronic ▁rev ▁lim iter ▁connected ▁to ▁a ▁delay ▁box . ▁ ▁When ▁the ▁delay ▁box ▁times ▁out , ▁the ▁engine ▁is ▁allowed ▁to ▁freely ▁rev - up ▁eng aging ▁the ▁cl utch ▁and ▁launch ing ▁the ▁motor cycle ▁dow nt rack . ▁ ▁As ▁you ▁can ▁see , ▁delay ▁boxes ▁can ▁be ▁used ▁on ▁both ▁cars ▁and ▁motor cy cles . ▁ ▁A ▁transmission ▁bra ke ▁is ▁not ▁required ▁to ▁use ▁a ▁delay ▁box ▁for ▁drag ▁racing . ▁When ▁rac ers ▁were ▁educated ▁to ▁this , ▁and ▁also ▁shown ▁ways ▁to ▁util ize ▁delay ▁boxes ▁on ▁motor cy cles , ▁there ▁was ▁some ▁alle viation ▁of ▁the ▁early ▁controvers y . ▁ ▁Del ay ▁boxes ▁improve ▁starting ▁line ▁reaction ▁time ▁accuracy ▁for ▁drivers . ▁Del ay ▁boxes ▁do ▁not ▁do ▁this ▁autonom ously . ▁Driver ▁interaction ▁is ▁still ▁required ▁to ▁launch ▁the ▁vehicle ▁and ▁driver ▁skill ▁is ▁still ▁required ▁to ▁achieve ▁a ▁favor able ▁reaction ▁time . ▁A ▁small ▁number ▁of