1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 63Get this manual
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OIL INJECTION
CLEANING AND INSPECTION
Oil-tank 1U sin solv nt, cle th oil-ta nk2 Drain th solv nt and dry th ta nk3 Insp ect th oil-ta nk for cracks, and re place it if re uire dOil