The HPI Racing Roto Start Back Plate V3 14MM Hex is just one of a great range of RC Spares that are available from us both in store and online. Roto Start back plate for the F & G Series Nitro Star Engines that use a 14mm hex one-way bearing. To use this back plate, your F or G Series engine must be fitted with 107829 - ONE WAY BEARING 14mm HEX FOR PULLSTART/ROTOSTART For use with the following:HPI ROTO START 3 SYSTEM (FOR NITROSavage XL 5.9 GTXL-6G3.0 ENGINE SLIDE CARB W/PULLNITRO STAR G3.0 HO ENGINEBullet ST 3.0Bullet MT 3.0NITRO STAR F4.6 V2 ENGINE NITRO STAR F3.5 V2 ENGINENITRO STAR F5.9 ENGINENITRO STAR G3.0 ENGINEWR8 3.0 2001 WRC Subaru Impreza Manufacturer: HPIModel: 120277 Roto Start Back Plate V3 14MM Hex