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    Testing rectifier? Help!

    I have a 1989 90HP 3 Cyl Merc and a Clymer manual. The manual does not cover the testing procedures for a 3 terminal type of rectifier. The maual shows a 4 terminal type and procedures for same. Anyone know the test procedures for the 3 terminal type? The rectifier has a center terminal labled...
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    Merc 2 stroke operation Question

    This is a TECH question concerning specific 2 stroke operation as it applies to a 3 cylinder Mercury OB. I am familiar with basic 2 stoke operation of a single cylinder engine. I have a 1989 3cyl 90hp 2 stroker Merc. For many months I have been experiencing "periods" of power loss. The problem...
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    1995 Stratos201proxl with Evinrude 200 V6

    I am contemplating a purchase of this type boat and motor. Can some of you experts give me a rating on this engine? Good, Bad or Indifferent? I am familiar with Mercs but not the Rude 200 Vindicator V6 is it problematic? Thanks
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    1989 Merc 90HP 3 Cylinder Power Problem

    This engine is still experiencing the same intermitent power loss problem after many hours of troubleshooting and I am stumped.HELP!<br />Problem: After throttling up on plane (3,000 - 3,500 RPMs)and running for a approx 5 minutes the engine experiences an intermitent power loss of one cylinder...
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    Cylinder Power Balance Test 90HP 3Cyl

    Can someone tell me what rpm loss and running characteristic that I should experience when performing a cylinder power balance test on my 90hp 1989 3 cylinder Merc.<br />With the engine idling at 900 rpm,s in nuetral.<br />It is my understanding that when I disconnect and ground out spark plug...
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    Trigger Who has Part Number Clarification

    After disassembly of my out board 90HP MERC 1989 3 cylinder I have noticed that the Mercury P/N on the trigger assembly differs from the one listed in the Mercury parts manual. P/N 99021A3 (manual) versus 99021A5 (part), can anyone tell me what the difference is between the two (other than the...
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    1989 90HP 3 Cyl Mercury No Power Production On Number 1 Cylinder (STUMPER)

    This is another posting regarding the same problem.<br />S/N OC162559 1989 90HP Mercury 3 Cylinder, Single Switch Box System (Thunderbolt V Maybe).<br />I have lost power production on number one cylinder. No change in RPM when disconnecting NO1 plug wire during idle or any power setting along...
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    Reed Valve Principle of Operation Question

    On a inline 3 cylinder 2 stroker Outboard engine that utilizes the circular Reed Block assembly located between the carburator throttle body and the lower crankcase. What force opens the reed valves? Is it mechanically actuated by the crankshaft or opened by the pressure differential between...
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    Mercury 90HP 1989 or 1990?

    My "SUPPOSEDLY" 1989 Merc 90HP 3 cylinder oil injected S/N OC 162559 (on the upper unit) has an ignition system that differs from ALL of the schematics that appear in the Clymer Mercury Outboard Shop Manual for 1972-1989 45HP through 225HP.<br />My ignition system has a single switch box mounted...
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    1989 Mercury 90 HP Power Problem

    I have a 1989 Merc 90HP oil injected, 3 cylinder,S/N OC162559 with a low/no power production from the top cylinder. During my last fishing trip the motor was hard starting,then shortly after throttling up on plane it lost power and began to stumble at higher rpms. Rough erratic idle condition...
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    1989 Force 125 HP Telltale Weeper? Flow?

    Can someone tell me if the 89/125 Farce has a tell tale weeper (pee) hole outlet to indicate water flow thru the power head. If so, what is it's location?<br />The only outlet that I can confirm (other than thru the prop) are two 3/4 inch holes side by side located on the Intermediate housing...
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    1989 FORCE 125 H/P Elusive Ignition Problem

    First the bad news, I am working on a FORCE. Now for the secondary issues and questions.<br />First off, how do I determine what BRAND of ignition system have I encountered, the book (SELOC) lists Motorolla and Prestolite?<br />The ignition system has bright blue coils and control packs is this...
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    Water Inlet ? 1989 FORCE 125 HP

    I have a simple and maybe stupid set of questions. My neighbor has purchased a used 1989 Force 125 HP outboard. We are attempting to start and run the engine to check it's performance "out of the water" in the maintenace shop. Where is the water inlet to the engine located on the lower unit...
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    Mercury 90HP Temperature Sending Unit Location?

    I have purchased a 1989 90HP Mercury O/B S/N OC162559 Inline 3 cylinder. This motor has a overtemp warning and a low injection oil quantity warning system. There is a temperature gauge installed on the instrument panel but it does not work (12 volts is present at gauge with key on, but no...
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    Mercury 90HP EngineTemperature Sending Unit Location ????

    I have purchased a 1989 90HP Mercury O/B S/N OC162559 Inline 3 cylinder. This motor has a overtemp warning and a low injection oil quantity warning system. There is a temperature gauge installed on the instrument panel but it does not work (12 volts is present at gauge with key on, but no...
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