36mm Piston Ring 29 30.5 cc HPI Baja CY KM Rovan Duratrax 5B 5T Losi Zenoah FG Remote Control Toys Parts NEW 36mm PISTON RING - ONE PIECE ONLY . FOR 29 / 30.5 CC FUELIE GAS ENGINE USED ON HPI BAJA, KM, ROVAN, FG, Duratrax, Smartech, Carson. Losi 5ive T AND OTHER BAJAS 29CC . MADE BY CY - THE ORIGINAL FUELIE GAS ENGINE MANUFACTURER FOR HPI BAJA .