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    1998/9 Merc Optimax 150 DFI TPS replace

    Howdy, I have a 1998 Optimax 150-- the motor Ser# is a 1998, but i think the powerhead was replaced, since that has a 1999 date on it. I'm having occasional prob's with the engine stalling at idle speeds while trolling-- the idle seems a bit rough. [Sometimes-- infrequently-- when the...
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    1999 Opti DFI 150 stalls

    Howdy Just bought my 2nd boat with 1999 2stroke Optimax 150 DFI; the motor runs and starts well, but while trolling it will occasionally stall. The prev owner had the engine serviced when he bought it 3-4 yrs ago, but rarely used the boat after buying it. I ran a bottle of sea foam thru it mixed...
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    merc opti 150 stalls

    Howdy Just bought my 2nd boat with 1999 2stroke Optimax 150 DFI; the motor runs and starts well, but while trolling it will occasionally stall. The prev owner had the engine serviced when he bought it 3-4 yrs ago, but rarely used the boat after buying it. I ran a bottle of sea foam thru it...
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    Trailer method WOT timing

    I need to adjust my WOT timing on an 89 E150XP; I can't afford a wheel (who can?), don't have a horse trough, the lake is never smooth enough to attempt this while moving, and waterskiing close behind with a timing light in one hand seems "unlucky".:^ Have any of you tried adjusting WOT at the...
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    timing base and power pack question

    I've seen a couple of similar threads, and another member and i have had exactly the same experience with the same engine-- E150STLECEM. The problem was sporadic misfiring/no spark at random cylinders, leading to a difficult start and sluggish going intially-- and then no problems once warm and...
  6. W

    automotive decarb?

    Is it ok to use automotive carb cleaner to decarb a 2-stroke? Can't find the deep creep spray locally, but have the seafoal fuel additive. thanks
  7. W

    automotive decarb?

    is there any reason not to use automotive decarb on a 2 stroke? I can't find the deep creep spray locally, although they do have the seafoam you add to your fuel. thanksd:)
  8. W

    bow-mounting w/ rails

    My 18 ft center console has rails along the bow; I'd like to mount a trolling motor up there. Are there any decent ways to do this-- any hardware or ideas out there? There is not much width (~3 inches or so) along where the rails are mounted, and then a drop to a raised deck-- not sure how this...
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    automotive inductive tach/timinglight

    Howdy, I am curious whether there should be a different read from an inductive automotive tachometer vs the tachometer hooked up to the engine. I am reading a significantly higher rpm on the inductive tach than the tach on the console, and I think the idle rpm on the dash tach seems closer to...
  10. W

    carb fuel contin'd

    Folks-- thanks for your continuing help. I had a fuel leak when pumping the bulb on my lowest of 3 carbs--fuel jetting out of what was suggested to be the bowl vent. I rebuilt all 3 carbs with OMC kits-- replaced all gasket, needle valve, float and seat, core plugs, etc after cleaning and...
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    E150 XP primer question

    First of all-- many thanks for previous advice on several posts of mine; y'all have the professional patience that seems to be lacking in the marine mech's in my area. I had a major fuel leak coming out of the bottom carb when i pumped the bulb-- rebuilt all three carbs last night, and the...
  12. W

    major carb fuel leak

    I’ve been having trouble with excessive smoke in exhaust and low WOT rpms—thanks to great suggestions on this forum, I checked for fuel leaks. One problem was the priming bulb, which I replaced and the new one solved one minor problem with not staying full—never got full and stayed hard. The...
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    Probably dumb WOT rpm question

    My 1989 150XP has low WOT rpm-- should be 5-6K, but reads 4K on the tach. I borrowed a timing light/tach to check the tach, which could be off-- but need to get to the water to look at this. However, the prop on this motor is 14 X 24-- which seems highly overpitched and is probably...
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    carb repair kit: OMC vs other?

    I am planning to clean and rebulid the carbs on my E150STLCEM and notice that there is a Sierra repair kit (18-7046) that "replaces" the OMC kit (OEM 0398526). Does anyone know the differences, if any, between these? I noticed that the Sierra kit does not contain a replacement float-- does the...
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    How to find correct prop specs?

    I am worried that I am "over-propped" on my 1989 Evinrude 150, because of low WOT rpm readings. I am trying to borrow a hand-held tach or timing light w/tach to check my tach reading (BTW-- is there any problem with using an automotive one with the CDI ignition?), but was wondering how someone...
  16. W

    How to find correct prop specs?

    I am worried that I am "over-propped" on my 1989 Evinrude 150, because of low WOT rpm readings. I am trying to borrow a hand-held tach or timing light w/tach to check my tach reading (is there any problem with using an automotive one with the CDI ignition?), but was wondering how someone...
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    Low RPM at WOT

    1989 150 Evinrude; the manual says that the WOT rpm should be ~5k, but I am topping out at 4k; i.e., the throttle is all the way to the console. I'm a complete novice with this type of thing-- could it be that the throttle linkage needs to be adjusted to allow for more room at the top, or could...
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    Fuel line question

    when i pump the bulb, i get fuel going to the engine ok, and the engine starts great, but the bulb never gets hard--- is this necessarily the bulb, or should pressure stay tight at the engine side as well. The in-line fuel filter never actually fills, which suggests to me at tleast that there...
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    1989 150 V6 Evinrude excessive smoke

    This engine runs great, but the EPA is about to shut me down-- there is excessive oil smoke at all speeds but it is obnoxious at idle or trolling speeds. I have been advised by two different mechanics to switch to manufacturer (Evinrude/OMC/Quicksilver) 2-stroke oil, and am going to try this...
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