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I have reassembled and bled [the Yamaha] trim unit, and it is now working great. The tool recommended above to remove the caps worked great. One point to note for other owners of a 1987 Yamaha 70 trim unit: the 1987 caps are not compatible with the newer caps. The caps from 1987 have a much shallowe...

Thanks for the guidance. New tool and parts are on the way. Hopefully I will have no leaks next week.

Thanks for the thorough reply. I have just three more questions. Q4. I think you mentioned that both the new and old trim caps have the same thread pattern. I am unable to find an style trim cap. Can you confirm that I can use a new style trim cap instead? Q5. Is the same tool used to remove both th...

Q1: who sells new seals for a 1987 Yamaha 70? Q2: who sells new cap with seals installed for a 1987 Yamaha 70? Q3: is there cross compatibility between the 1987 parts and later years? BACKSTORY: [A 1987 Yamaha 70-HP outboard engine has a] trim unit that likes to squeal when it reaches near the botto...