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    Tohatsu ECU replacement

    I have a Tohatsu 90 nHP model # MD90C2 3FW , Serial #034700AX. I am told the ECU needs to be replaced. When the ECU is replaced does it need to be (not sure of the term here) flashed or set to work with my injectors? Or can I expect it to be plug and play ? I am obviously not familiar with...
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    Is a 2010 Tohatsu 90 TLDI the same as a Mercury of any type ?

    I am not familiar with the Tohatsu TLDI technology nor the above mentioned motor. I have heard of the Mercury Optimax and the EFI but again am not familiar with them. Then there is the BRP Etec another fuel injected two stroke. I have read a few articles on these engines but not comparisons in...
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    Mercury 2018 2.5 HP 4 stroke fuel pump question

    Mercury part number 8M0072277. Does anyone know if this pump can be rebuilt ? I see a new one runs around $80.00. I took mine apart and can see there is a pinhole in the diaphram. If there is a kit available it is an easy rebuild. The motor seems to run fine without it with just a gravity flow...
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    18 HP Tohatsu 2004 18B Link rod removal on carburetor

    I aquired this motor and would like to get it running. I removed the carburetor and found that it was certainly in need of a long soak cleaning. I will check the auto start mechanism as I have read several post on it. For now my issue is how to remove the rubber boot which covers the link rod...
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    1987 Yamaha 25 hp 2 stroke Oil Seal Cover

    This is part number 689 45344 00 94. Before I start to pry and possbly destroy this cover does any person have suggestions for its removal. ? Does the driveshaft need to be removed ? The seals are leaking so that there is air leaking out with about 8 lbs of pressure and slight water intrusion. I...
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    Yamaha 175 ETXG Compression

    My compression on this motor is 90 pounds on 4 cylinders and about 87 on the other two. It has a professional repaint and looks good. Its got quite a few hours on it. I put it aside a while back. A freinf of mine ask if I can get it goig again for him. It has spark on all six, the compression is...
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    175 HP Heavy. Has anyone run or started one on a hoist.

    I have run out of stands and tanks. I acquired an 80's model 2 stroke 175 Yamaha. Today I went to the metal yard and picked up a bunch of 2" x 2" x 3/16" tubing to extend my boom and a bunch of 1/4" thick L metal to be used as outriggers for my cherry picker. I want to be certain of weight...
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    Gear Housing Nut Removal 1988 35 HP Mercury

    I have some work to do in my lower unit and am temporarily stopped by the gear housing nut. I have read that breaking the nut (made of Nylon) is one option. The Mercury tool part # 91 91947 is a bit expensive. I have no problem breaking it out as it is only a $10.00 part but then of course would...
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    2007 Tohatsu 3.5 HP 4 stroke. No spark.

    Thanks for looking. Is there a way to test the igniter on this motor.. Ignition system is comprised of the flywheel and igniter. I dont have a spare to switch out. I am going to reinstall it today, scraping away some paint to be certain all is grounded. I was thinking there must be an Ohm's test...
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    2006 Mercury 9.9 M4 1F10201FK Oil pressure switch

    Can or does this switch activate a guardian mode on this motor.? Can a bad switchbox keep the oil pressure light illuminated ? When started the light will illuminate for the 5 or so seconds then go off. It then comes back on and will stay on whether idling or throttled up.. I did check that...
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    35 HP Mercury 1035213bc 1988 Shift cam and shaft question.

    Tell me something good. While in the process of servicing the lower unit I noticed a bit of milky appearance of the gear lube. Presure testing revealed a leak at the shift shaft bushing seal. I removed the bushing and O ring and seal and replaced them. Now comes my issue. The shift shaft would...
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    Tohatsu 3.5 4 stroke 2007 Removing the lower pump housing.

    I have a couple or more of these to work on so I started with the probable parts candidate. I intended to get the lower water pump housing out . The old original gaskets were hard and bound to stay in place. The bolts holding the top of the water pump were a challenge by themselves but were...
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    Tohatsu 3.5 hp 4 stroke OR 157...

    Finally realized I needed a manual for the two of these motors I have. Should be here by midweek. I have a manual for 4/5/6 HP 4 strokes starting 1999. I dont want to use it as the properone will be here soon enough.I would like to get my ducks in line so that I can at least start an evaluation...
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    Help with my Johnson 25 RLCUR Frankenmotor.

    This thing has a history of running bad, spitting, stalling running good at high speed then stalling. I saw an old bulletin regarding this on the Tube but it did not help. I rebuilt the carb, then again maybe even three times. After all that I realize its an air leak somewhere. Sprayed WD...
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    T9.9 GELH Almost no compression. Need repair manual.

    I have recently aquired the above motor. It appears in great condition but the compression is around 50 pounds per cylinder. As I turn the flywheel I feel a bump I am not sure if it is a valve adjustment, timing belt issue or something deeper. I was looking for a used manual on an auction site...
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    Tohatsu MFS 3.5A HP 4 stroke. Shift Shaft Lever Question

    AKA Mercury 3.5M. I recently came by a couple of these motors in which the shift handles, shift shaft lever, are frozen in place. I removed the lower unit to find the the lowers in working order for the most part.. I then removed the powerhead on one of them. I soaked and heated the shift shaft...
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    Nozzle well unavailable Part # 0434398 ??? 1990's 20 to 35 HP and others

    I have found my nozzle well has some hairline cracks in it.I would like to replace it, this site and others all say unavailable. I have replaced them in the past but this time I am thinking of an epoxy to get the job done.They certainly do not hold up well in my opinion as I have seen these...
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    F9.9 CMH 2008 Yamaha Ticking noise.

    This occurred to me today. The bulb lit. I thought of something. Usually I assume the answer or look it up or ask in theses forums. As the motor warms up I get a ticking from what I have assumed was the valve lash or to do with the rocker assembly or at least valve related. I thought to take off...
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    older Mercury 7.5HP 2 stroke 1977 and other years carburetor venturi question.

    Within the throat of some of the older Mercs is the plastic venturi part. Looks like a gun scope or something. I was wondering what effect they do have and what is the effect of leaving them out . They are a pain in the butt to install.Thank you in advance for your replies.
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    Roller to bunk . Carpet needed or ?

    My trailer rollers are going bye bye. Salt water has taken its toll. I am pretty good about rinsing it but time and salt has taken its toll on the rollers and hardware. I am in San Diego, around here most trailers use bunks not rollers. The launch ramps are such that rollers are not necessary in...
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