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  1. S

    Low compression options

    Compression readings are about 90 on all three cylinders in my 96 Yamaha 75hp. Other than running a little rough when idling in gear, the engine is very fast, has great acceleration and starts right up. Therefore, I don't want to spend any big $ at this time to fix. Is it possible that the...
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    Yamaha 75 HP poor idling - timing issue?

    The engine starts fine, accelerates quickly, goes fast and runs smooth (but not when idling). The compression is exactly the same on all cylinders, but low (each cylinder is 92 to 93). Therefore, I'm not surprised that the idling is a little bit rough.<br /><br />Here's a wierd one. When I...
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    carb access on '95 Merc 40

    I want to rebuild the carbs on my 95 merc 40. Will I be able to remove the starboard side bolt on the upper carb without taking off the starter motor (in addition to the oil tank)? The space there for a wrench seems impossibly small.<br /><br />Thanks.
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    fuel pump - how does it work

    I rebuilt my fuel pump today and it works fine. After completing this relatively simple job, I couldn't understand the basic principle of how my '95 Merc 40hp fuel pump works. How does it get a pulse if there is no pulse line. I didn't see any obvious connections to one of the cylinders. So...
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    removing lower unit on 95 merc 40

    I am a newbie trying to replace the water pump/impeller for the first time. After taking off the five relavant nuts according to Clymer, the lower unit didn't drop at all(removed one bolt at the trim tab, one nut inside the trip tab cavity, a nut just forward of the tab, and a nut on each...
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