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    Lower unit swap 7.5 to 20 hp work?

    Let's say mid to late 70's. Will a lower unit from a 20 hp work on a 7.5 hp motor. Or vise versa.
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    Mercury 7.5 long and short shaft swap?

    Will the lower unit from a long shaft work on a short shaft? In other words are the lower units the same and just the mid section different?
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    Merc 9.8 won't go at full throttle.

    Runs great at all rpm ranges, but at full throttle it just acts like it's in neutral. 1/2 and 3/4 throttle are fine and goes right along. When you hit full throttle it just revs up like something is slipping. Checked for prop spun and it's fine. Any ideas?
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    What plugs in my 1985, 9.8?

    What are about the best spark plugs to run in my 1985 9.8? What name brand and heat range number?
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    Johnson 20 hp seems hot, actually has steam.

    Have a 1971 Johnson 20 hp with new thermostat and water pump. Had it out today and running at full throttle for 5 minutes the water felt hot and had some steam with it. But when I idled down it cooled real quick. Is it normal to run like this? The water wasn't that hot you couldn't touch it but...
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    9.8 stalls when putting in gear.

    Have a 9.8 and it starts up great, idles along fine but when I put it into gear, it stalls. I tried pumping the bulb and no good. I raised and lowered the float level, still no good. Any ideas?
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    35 hp. Mercury, no spark. Flywheel broke.

    A friend of mine has a 35 hp. Mercury about a mid 80. It was runnin great, he shut it off and when he went to start it, no go. Wouldn't start. He removed the flywheel and one of the magnets were broke with pieces laying under the flywheel. He went to a marine dealer and they gave him another...
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    9.8 stalls when putting in gear.

    Now my other Mercury 9.8 starts right up fine and idles along. But when you put it in gear and try to throttle it up,,,,,,,,,,It stalls. I did replace the fuel pump and when you pump the primmer bulb, it still don't work. I did have the carb apart to install the venturi. But that's just dropping...
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    Found the shift and prop won't turn problem.

    On my Mercury 9.8 I was having a problem at high throttle the prop only spun like you were trolling. Not fast at all. People gave me some suggestions and I checked them all out. After reading a post that laddies replied to I started thinking. Here what it was, the reverse lock out rod and ball...
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    Shift problems on 9.8.

    OK I think I might have found my problem. I stated in another post I can run at full throttle and the prop hardly spins. I notice tonight that the rod out of the lower unit with the ball on the top wasn't hooked up at the top. I understand that's the shift rod. If it's not connected and just...
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    Prop hardly turns at high rpm. Checked okay.

    I have the 1980 Mercury and at high rpm's the prop hardly turns. I had this in another post and some guys told me to check the prop. It might be spun. Well I did just as he said and it checks out okay. Now I'm wondering what else could do it? Under the motor base by the choke knob (under that)...
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    Motor runs good but prop hardly turns.

    1980 mercury 7.5 runs great at idle and at full throttle. But the prop hardly turns. It's like the motor is runnin full throttle and the speed is like trolling. I have this also in another post. But what is the rod that comes up from the lower unit with a metal ball on the end. Does the ball...
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    How does shallow drive work on a 7.5?

    I have a 1980 Mercury 7.5 and it has I guess they call it shallow drive. Well I left a friend borrow it and he said it would rev up fine but the prop didn't spin that fast. Is that the shallow drive? Also I noticed there's a small diameter rod coming up from the lower unit with a ball on the...
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    What year Mercury 9.8?

    Was told at 1 time it was a 1989, but when it comes to parts they tell me it isn't. I don't know. Serial number A112107. And I do know that's right cause I checked it over and over again.
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    Mercury 9.8 Carburetor venturi, Need it or not?

    I have a 1989 Mercury 9.8 and it doesn't have the plastic venturi in the throat of the carburetor. The previous owner said he lost it but the motor runs good. I didn't try to run it like this. Now my question is, does it have to be in there? What does it do? And what would my problems be by not...
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    Need part number for tiller handle?

    I have a 1980 Mercury 9.8 and need to know the part number for the tiller handle. How can I find out what it is or can someone help me out.<br />Thanks.
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    Will a 7.5 and 9.8 tiller swap?

    Will a 1979 7.5 tiller handle work on a 1979 9.8? Both cable operated.
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    Is there another tiller handle that will fit?

    I need a tiller handle for a 1980 Mercury 9.8. This is the one with the cable and not the gear. Is there another one that will fit from a different manufacturer? Ya know how some companies will produce a product for someone else?
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    Should I repair it or not?

    OK, here's what I have. A friend of mine called and asked me to fix his boat. I asked what was wrong and he said that when he puts the muffs on it and runs it, looks like water leaks from a freeze plug on the engine somewhere. First of all this is a Mercruise and he thinks it's a 140 or 150 hp...
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    Tiller handle question.

    Can I put a tiller handle with the gear on one that was cable operated? This is a Mercury 9.8. How much trouble is it?
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