This is the stock replacement Recoil Assembly for the HPI .21BB Engine. This is attached to the engine backplate. FEATURES: Assembled pull-starter INCLUDES: One recoil assembly Three 3x8mm cap head machine mounting screws REQUIRES: Using the original one-way bearing, or purchasing HPIG1430. SPECS: Thickness: 19mm (0.75") C.D. between mounting holes: 27mm (1.07") COMMENTS: This recoil is made specifically for the HPI .21BB engine. cmc 02/26/03 ir/jxs