Recent content by Cordovakid

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    Coil Adapter / Installation

    I purchased an aftermarket coil for my 25hp Merc. Thecoil came with a soft plastic covering sleeve that fits over the back of the coil (opposite to the wire). My motor's coil setup has a ground plate on the negative terminal with a screw bolt going down through the terminal to mount the coil...
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    Surging / Bogging 25hp Merc

    Was in some shallow water, 1980 25hp merc, and the LU got into some sandy bottom. Like a fool, didn't think anything of it...about 5 minutes later, lost power, no water coming from pee hole and some white smoke. Shut 'er down ASAP....let it sit for a day...long story short, I got REAL lucky...
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    25 Merc - Water Tube Question

    I have replaced my impeller on my 1980 25hp Merc....the copper water tube has an enlarged fitting which fits snugly over the water pump housing on the lower unit. However, before trying to install the lower unit, I took the copper tube and fed it up into the powerhead. It goes all the way in...
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    1980 Merc 25hp - Hard Starting Question

    Hey - so I've tried just about everything with this motor over the years. Starts great warm, but it a bear to start cold. Pump bulb hard, turn idle up and engage the enrichener (no choke on this model). My starting procedure is to leave the enrichener engaged while pull starting. Takes...
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    1980 Merc 25HP - Coil Connection?

    I am in the process of diagnosing a rough idle / hard start condition with my 1980 25hp Merc. I have noticed that I am getting a weak spark on one of my plug wires. The ohms seems to be OK coming off the coil, however. So, I pulled the plug wire from the coil and the metal connector appeared...
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    Enrichener Question

    I am somewhat confused as to exactly how an "enrichener" (not a true choke) works on a 2-stroke Merc. Specifically, I have an early 80's 25hp Merc that has the plunger-type button which is engaged when the "choke" knob is turned / pulled. My question is, when this plunger is depressed, does it...
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    25HP Merc - Low Idle Starting Problem

    I have a 1981 25hp Merc manual start which will start typically after about 5 or 6 pulls with the enricher engaged. After that, runs like a champ. Will always start warm on one pull, but ONLY if I advance the throtte to a higher idle speed. Once started, I can lower the idle back down as low...
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    25hp Merc Inlet Needle Spring?

    I am in the process of rebuilding the carb on my 1980 Merc 25hp, as I have always suspected this carb to be flooding (symptoms include rough low idle, hard start after a few hours, wet plugs, bulb going a bit soft after 20 minutes). The float appears to be in good condition (ie. no punctures...
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    Correct Plug Type - 25hp Merc

    I have a 1981 Merc 25hp manual start. The Merc OEM service manual states to use Champion L77J4 (which I understand has been superceded to L77JC4), but on the Iboats Merc plug chart, it states to use Champion L78YC for 25hp and L77JC4 for 18hp. Same exact powerhead, etc, just different jetting...
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    Start in Gear Problem - 25hp Merc

    Can anyone help diagnose a start in gear problem? I have a 1980 Mercury 25hp manual pull start, shift on the tiller, which will allow the operator to pull start the engine in any gear (F/N/R). I had a 1992 8hp Merc and also a 1979 7.5 Merc which would only allow me to start in neutral. I...
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    25hp Merc Pull Start Question

    I have a 1981 25hp Mercury with manual pull start. For some reason, this motor WILL allow the operator to pull the engine over with the rope start if the motor is in any gear (ie. forward, neutral or reverse). This is normally a safety feature that only allows you to start in neutral. I took...
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    25hp 1980 Merc - Correct Starting Procedure?

    Hey Guys - my 1980/81 25hp Merc is very, VERY difficult to cold start. Warm is OK - only one pull needed. But cold starts are not nice. I have the OEM Svc. Manual, but not the owner's manual, so I don't have access to the "OEM Starting Procedure", as it were. This model has a Tillotson BC1C...
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    1981 Mercury 25hp Very Difficult to Start

    I have a 1981 Mercury 25hp manual start which is a great motor, once you get it running. Plenty of top end / throttle response - even will troll down nicely. When the engine is warm, guaranteed one pull to get her going. However, starting this beast cold is a major pain. Here is my current...
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