1975 Evinrude 2HP Model 2502 Full Factory Service Repair Manual P/N 5087, Page 39Get this manual
Quality of the image is intentionally reduced!
5-6 ring landsSee Figure 5-13 Check pistonsize and using micrometerCorrect sizes given in Section 21dnss,
Apply coatoil to wrist pin, making sure surface is cleanPlace drop two of oil in