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    Power loss problem (vacuum leak?)

    I have a 1981 9.9 Marioner (the Japanese mariner model). Starts and idles great. When open up to full throttle, goes at full speed for about 15 seconds, then bogs and reduces to about 70% power. I have done the following and the problem still persists: 1. Got a new fuel tank, hose, bulb, and...
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    Overheating

    Mariner 9.9 (1981) seems to be getting hot and begins to lose power after 30 seconds or so going full speed. Telltale stream is strong, but nothing but a little mist coming out the exhaust relief hole on the leg. Is the telltale just indicating that pump is working, but not necessarily that...
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    Suspect overheating: Mariner 9.9

    My 1981 Mariner 9.9 runs excellent at idle (can troll all day long), but when accelerated to full throttle, it runs full speed for about 15-30 seconds, then progressively bogs down to about 70% power and remains there. I have cleaned the carb, new fuel pump and filter, new fuel lines and...
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    9.9 Mariner - power loss at full throttle

    I have a 1981 9.9 Mariner (Japanese Mariner). Starts well (firts pull always), idles perfect, but when I go into full throttle, it will have full high-speed power for about the first 15 seconds, then gradually loses power until it is going maybe only 70% power at full throttle. Never...
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    Which Mariners are really Yamahas?

    Anyone know the year and hp range of the Mariners that are really Yamahas?
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    Which Mariners are really Yamahas?

    Looking to buy a used motor. I understand that certain year and hp range of Mariners are really Yamahas. Anyone know: what is that year and hp range?
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    Correct carb float level? Merc 9.9

    Can't seem to get hold of a shop manual. Anyone know the proper float level for carb on 1987 Merc 9.9? Measure from where to where, and what is proper distance? Thanks.
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    Removing bearing carrier from Merc 9.9

    I need to remove the bearing carrier from my Merc 9.9 in order to replace the seals. The manual says that a special tool is required to remove the carrier, but if the tool is not available it states that you can use the thrust hub as a removal tool by placing it on the prop backwards, with the...
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    No water from exhaust ports on Merc 9.9

    My 1987 mercury 9.9 has a good strong stream out the peehole, and the water coming out is warm (not hot) to the touch. But there is no water coming out of the exhaust relief holes on the upper motor leg. SHOULD there be water coming out the exhaust relief holes on this particular model?? Or does...
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    Which is the number 1 cylinder?

    I want to check the timing on a Merc 9.9 (1987). Which is the number one cylinder -- the one the timing light hooks up to?
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    No water from exhaust on Merc 9.9

    My 1987 mercury 9.9 has a good strong stream out the peehole, and the water coming out is warm (not hot) to the touch. But there is no water coming out of the exhaust relief holes on the upper motor leg; should there be water coming out the exhaust relief holes on this model? If yes, then what...
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