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    Fuel question ...

    i know there's been plenty of discussion on the best octane to use 87, 89,91 ... I agree with the use FRESH 87 high quality gas. My question is are the big guys like Chevron, Shell, Exxon any better than say a Citgo or a Diamond Shamrock? I swear that my truck runs better on Shell or Chevron...
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    Electrical wiring question ...

    I was cleaning up electrical connections and came across two corroded circuit breakers which appeared to be wired in a series - 20 amp - appeared to be ignition and maybe trim? Wires are hard to follow from the back of the boat to the front. So I get three of the four corroded nuts off and...
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    salty motor ... inside scrub

    I've found out that the onboard flush hose on the Yamaha isn't for flushing the entire engine or meant to be used to run motor to flush internal workings = I've been leaving a lot of salt water inside my motor. Wondering if there is a good cleaner like CLR I can use or CRC rust inhibitor I can...
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    motor flush ... additional Q

    The yamaha I have has a removeable hose fitting that can be attached directly to a hose for flushing. Water comes out the lower unit, pee hole, prop, etc. Is this providing enough water to start the motor and run safely or are the muffs better attached to the water intake on lower unit?<br...
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    factory manuals ...

    I've seen several names for a "factory" manual and was wondering if there is any difference and if so which is the better one to order ... Shop manual, repair manual, service manual, etc ... are some geared more towards mechanics/assume you know certain terms or concepts and others more...
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    racor filter question?

    I'm looking at installing a Racor fuel filter/water separator on my 115 yamaha. I am looking at the 320R-RAC-01 recommended for outboards/60gpm/1/4" fittings. Wondering if any of you have installed this model and if it comes with barbed fittings so I can just mount the filter, cut the fuel...
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    spark plug question?

    Yamaha 115 owners manual/Clymer indicate .035 - .039 for the NGK BR8HS-10 specified for the motor. <br /><br />Had mechanic checking out a rough idle and he indicated the the plugs were gapped too close and he gapped out to .045 - stated that the "-10" after the "HS" meant to add .010 to the...
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    yamaha guages

    wanted to know what the "battery mode" is actually indicating on my Yamaha tri-mode (trip,battery,time) guage - is it measuring the amount of charge left on the battery or is is actually a measure of how much the system is charging? My guage will read typically read over 12.0 after a fresh...
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    idle rpm (neutral) -vs- idle rpm (in gear)

    I have a 98 yamaha 115 hp and it is currently idling at 1000-1050 out of gear and between 700-800 in gear. My question is ... can the idle rpm in neutral be adjusted down without affecting the idle speed in gear? Can they be adjusted separately? The book indicates that neutral should be...
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    50:1 is that ideal mix for all rpm's

    Just wondering if pre-mixing at 50:1 gives your engine the necessary lubrication at high rpms? I'm assuming that oil injection systems give more oil at high rpms and less at low? This all comes back to the question to keep an oil injection system hooked up or disconnect and premix. I know...
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    115 yamaha inshore - sputter/oil leaking

    I have two problems that may be related/just started on my '98 115 yamaha 'inshore model' ... I've noticed that the motor will run rough at idle after it's had a trip across the bay (30 minutes or so of running) Last three trips the engine has also started to sputter a little while waiting at...
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