The serial number tag is situated about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found amongst the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers of your vertical drive must be located to the engine model and serial number https://yamahaoutboardmotorsdeale51615.blogthisbiz.com/43985695/the-greatest-guide-to-yamaha-6hp-outboard-fuel-mixture