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  1. W

    ngk buhw-2 vs buhw spark plugs for 90hp merc?

    I've got a 90hp elpto sn OT087666. Now I have the -2 plug in there but I see some non -2 plugs for sale as well. What is the difference between these 2 ngk plugs?
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    oil pressure switch/sensor for 2 str 90hp elpto?

    I have e a 00 Mercury 90hp ELPT 2 stroke. s/n ot087666. I am paranoid about possible failure of the oil injection system. Is it feasible to install some kind of oil pressure switch in the oil delivery line so that if oil pressure drops an alarm is set off thus gving the operator time to shut...
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    where to add water pressure hose for gauge on 90hp elpto

    '00 Mercury 90hp ELPT 2 stroke. s/n ot087666 built in '99 Please see attached pix. I added a line to measure water pressure. It seems to work, but I have a couple of questions. Is this the right place to add that hose barb? I notice some green corrosion on it, is that going to be problem...
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    why don't OBs have a water temp sensor besides squeal

    Why is it that with OB's they don't use a water temperature gauge? I know that water pump pressure is very important and is measured but it seems like it would be just as important to see the actual engine temperature in case the system picked up some blockage. I think most have a squeal...
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    replacing seals on 90hp 18 year old merc ow difficult?

    I've got a 90hp 2 stroke s/n OT087666 Merc. Water is getting into the lower unit as evidenced by that milky look. I've ruled out the gaskets on the filler plugs so I'm afraid its seals inside. I've done all my own work on this motor myself but after reading the shop manual I'm intimidated...
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    time to replace lower unit seals? s/n OT087666? 90hp merc

    I've got a 90hp 2 stroke s/n OT087666 Merc. About 18 years old now. I check the lower unit oil frequently and for the first time I saw about a teaspoon of water come out with the oil. It was not mixed in and milky but was separate. I replaced all the oil and went on a boating trip putting...
  7. W

    stiff action on throttle

    I've got a '00 Mercury 90hp ELPT 2 stroke. s/n ot087666 built in '99. The shift throttle has always had a lot friction in it. Seems like its getting worse. I don't know if the problem is in the shift handle mechanism or due to tight turns of the cable going under the deck and coming to the get...
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    how merc tachs work on 00 90hp ELPTO

    Does anyone have a general idea as to how the tachs work on the 2 stroke 90hp elpto? Are they just frequency meters counting the number of pulses/sec coming out of alternator? Reason I am asking is that I'd like to design a small digital tach. Like a series of LEDs in a row. Very simple...
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    are all VMAX 4 stroke?

    Sorry to ask such an obvious question but looking on the web I can't determine if VMAX means 4 stroke. It seems to mean hot rod motor. I'm considering looking at a 2008 200 VMAX. Its in another town so I havent' seen it yet. If its 2 stroke is it DFI?
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    down view and side view ducer on trolling motor?

    I am wanting to add sonar up front on my trolling motor. I'd like to mount a down view and side view ducer on the trolling motor but I don't know if this is feasible. The ducers I've seen are very LONG and I have not had any luck googling about this.
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    repairing trim button on throttle handle

    Has anyone worked on a throttle handle like the one shown in my attached pix? Its a throttle for a 99 90hp 3 cyl. What happens is that when I push the trim button back (lower it) sometimes the spring does not kick the switch back to neutral when released so the trim motor will sit their...
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    hole in lower unit- ouch but maybe lucky

    After a recent trip to the coast where I bumped into some submerged foundations I noticed this hole in my lower unit. I think I got lucky in that it punched thru into the cavity where water is anyway. Do ya'll agree. I don't see any water in the the oil. I think I will plug the hole with...
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    release power trim on 2cy 90 hp Merc

    Is there a way to manually release the power trim tilt on a mercury 90hp 2 cyc s/n OT087666.? The reason I am asking is that recently I had a problem with the power trim relay failure. This wouldn't be a big deal except if it failed in the down position then I wouldn't be able to get it onto...
  14. W

    power trim sending switch for 90hp merc p/n?

    I am looking for the power trim sending unit switch p/n for a 90hp s/n s/n OT087666. It mounts just under the motor near the power trim motor. I've looked in the merc online parts catalog but it doesn't show up anywhere under electrical, power trim, or accessories. sorry about the grey out...
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    synthetic oil makes for easier starts on 90hp merc '99 model

    I just did a lot of boating on the bays so I used lots of fuel. In the past the motor has always been fussy about restarting after running a while and then being off for say 30 minutes or so like after a drift over a bay. Often I'd have make sure motor was trimmd vertically perfectly and...
  16. W

    intermittent trim failure on 90hp '99 model merc 2 cyc

    s/n OTO87666 The power trim on the motor is very intermittent. I understand how it all works, the relays reverse the polarity to make it run in or out no problem with how it works. Same failure whether I activate it from the motor cowl or from up front. Fails sometimes going up or down...
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    new and old power pole differences

    Can someone comment on the improvements/changes that they have made to the power pole designs from 2016>2017? I know that they went to hydraulic hoses instead of tubing and the pump got smaller (supposedly stronger) and all models are powder coated not annodized. Normally I prefer to buy the...
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    power pole comparisons power pole II vs Sportsmans

    I've been reading the specs of these 2 power poles and as best as I can tell the only difference between these 2 is $300 Black or black/white choice 3 yr vs 5 yr warranty the looks of the arms are a bit different Pro2 looks "cooler" but that's subjective. Besides those items I can't find any...
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    starter voltages on 90hp S/N OT087666 2000 yr model made in '99

    Lately when I first start up or if I'm out floating around and the motor gets cool when I go to start the starter goes. uh.....uh.......uh......uh.......vroom start. So for about a 1/2 sec or so you think, oh,oh, we may have a low battery but then it hits vroom and it cranks fast. I'm thinking...
  20. W

    when to switch from oil injection to pre mix on 90hp year 2000

    I've got a 90hp year model 2000 made in 1999 with about 300hrs on it. I feel like I'm sitting on a time bomb with the plastic gear driven oil pump. Any rules of thumb about when would be a good time to switch to a premix? My only hesitancy with going premix is that I have a large tank. To...
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