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Hi, I went to the yamaha parts section and looked for my motor. I have model 50 ESRS, my full tag is hard to read because of damage. So the RS I have seen on identification page and that looks like damaged letters on my tag. My question is under the parts there are no 50 ESRS motors only a 40 ESRS showing. Was there a model 50 ESRS made that year? only other number on motor is D81950 on freeze plug on engine cylinders, is this ID number also? and if so what does it mean?