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  1. R

    1985 Merc 50hp 4cyl died at WOT very smokey/hot

    Hi all, Appreciate your thoughts on this. Was running at wide open throttle today (13' Boston whaler) and I noticed I started to lose power, turned around saw the engine smoky so I cut it. Wouldn't start again, got a tow home. I did a quick compression test when I got home and had: 1. 125 2...
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    Looking at purchasing a used 2001 40 hp Merc 2 stroke

    Hi all, im looking at picking up this motor used for a 13’ whaler. I like that it is light compared to 4 stroke. anything in particular to look at on these? Allegedly a fresh water machine with good compression (~125/cyl). i was planning on checking compression myself and taking a peak at...
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    1985 Merc 50hp 4cyl Carburetor Rebuild

    Hi All, Im working on rebuilding my carbs this fall and I'm looking for some general advice. I got the carbs off, but it was quite tricky to gain access to the two bolts that secured the carbs to the powerhead, especially the bottom bolt on the starboard side. I took the starter motor off...
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    1985 50hp grounding voltage regulator

    Recently replaced the OEM rectifier (part#62351A1) with a CDI voltage regulator (part#193-5114). The old rectifier was grounded by contact to the motor while the CDI regulator contains a ground wire. This voltage regulator doesn't mount that great, as its really meant for Johnson/Evinrude...
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    Mercury 50hp 1985 overcharging

    Recently hooked up a gps/fishfinder and it shuts down under power, but runs fine off the battery. Hooked up a multimeter to check voltage under power and realized as throttle increased so did voltage until the gps shuts down to protect itself. What can I do to remedy the situation? Do I have an...
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    1985 Mercury 50hp 4cyl replace fuel filter

    Stupid question: I cant figure out how to remove the fuel filter to clean/replace. I would think the outer plastic cover unscrews to reveal the internal filter, but I cant seem to unscrew it and I didnt want to crack the plastic. its Mercury part #87946A13 (outboard serial # 0A132113) Do I...
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    1985 Mercury 50hp 4cyl potential cooling problem

    Took the motor out to start today and she ran great. Replaced impeller and gaskets yesterday, had a steady stream of water from the tell tale. I ran the motor for 15 minutes at idle and then shifted into fwd and reverse just to test. all seemed good. Tell tale water wasn't very warm which...
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    1985 50hp 2 stroke 4cyl No Spark

    Hi all, Thanks for taking the time to read through this. Long story short, restored a 1969 13' boston whaler and stuck this 50 on the back. After 2 years of work, finally put in for splash-down and had 20 mins of bliss. Was giving the motor throttle and it stopped responding (I thought it was...
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