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    Thrust washer on my 89 mercury 90hp?

    I just got a 2nd hand stainless prop for my 89 mercury 90hp outboard and have a few questions on it.<br />When I removed the old prop it seems to have some kind of washer on it that sat between the lower unit and the prop that had a tapered hole though it for the prop shaft. The taper in this...
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    Brass (or bronze) Props?

    Hi,<br />I see lots of aluminum props and some stainless steel but I just got offerd a Brass prop (or may be bronze) for my 90hp mercury outboard..<br /><br />Can anyone give me some info on this kind of prop and why I don’t see them around?? Whats wrong with them?<br />Thanks as always<br />Dave
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    Aluminum to stainless prop questions??

    Ok Prop question.<br />I understand that the pitch is the theoretical distance that the prop would move per rotation … and that by changing this your WOT will change by 3-500 RPM … but what about diameter..<br /><br />I have a 13x19 aluminum prop (that has the engin running just right at WOT)...
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    Dumb question on Running lights.

    Dumb question on Running lights. I have a 19 foot boat and seem to be confused by they way some people run at night (dusk/dawn) and the US Coast Guard info I have.<br />Am I correct in thinking that when running I should have my red and green front light on and my white light at the back on...
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    Mac River Runner Prop Savers..?????

    Has anyone got any comments on one of the Prop Savers listed here? http://www.propsavers.com <br /><br />I ask because my boss just did 3k worth of damage (smashed prop, ripped chunks out of the skeg, bent the drive shaft etc) to his Yamaha outboard on his flats boat when we hit some crap...
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    Batter switch question and roasting diodes

    I have 3 larger batters on the boat I just purchased. 2 are in parallel and one is stand alone and they are connected via a rotating battery switch with the usual 1-2-ALL OFF options. My question is I remember reading about not switching the switch when the motor is running…. Does this mean not...
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    mercury controls? warm up lever ??

    Is there a way to set the throttle to warm up when you first start a outboard with mercury control’s?<br />On my older Johnson that was a warm up lever but does not seem to be anything like that on the mercury controls for my ’89 90hp.. any suggestions?
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    Mercury and Mariner? what is the diffrence?

    Is there a difference between the two or is it like Johnson and Evinrude?.. I have a '89 and want to know if the Mercury manual for this motor will work for tune ups. Thanks Dave
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    what Octane and why????

    I have read that you should not run higher octane gas in 2 stroke outboards .. I have a 90hp mariner 1989, what grade gas should I run and why?<br />Thanks as always … Dave
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    compression..? does mine suck??

    Hi,<br />I have what I think to be ‘89 (OC136657) mariner 90hp (3 cylinder). I know enough about boats and motors to know that I know next to nothing … other then I think have picked up a dud.!! <br />Can anyone tell me what the compression should be?? Its 90-95-90 psi now and I’m guessing that...
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    what prop should i use?

    Hi,<br />I have a old (’73) Aqua sport fiberglass center console boat with a 90 hp 1989 mariner motor on it. I am thinking about getting a spare prop (or a better stainless one) and wondered if anyone had a suggestion on pitch? The boat is used in salt water for fishing.. Not after super speed…...
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    how to remove the oil injection on a 90hp mariner?

    I want to remove the oil injection on my 1989 90HP(i think serial number OC136657) mariner?) and run just pre-mix?<br />Can i just disconnect the oil pip that goes to the fuel pump and cap it? Or is there more to this that that? I was thinking of routing the pipe from the pump back to the oil...
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    Please help.. need year on Mariner motor?

    Hello everyone,<br />I need to do some work on a motor but need to know the year. I could not find any info on the Mercs and Mariners to decode the serial numbers.<br />It a Marriner and the serial number is OC136657.I think it is a 90hp?? Can canone confirm the HP and Year on this? Thanks as...
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