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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Well to let everyone know the outcome. I picked up a new fuel pump and two carb rebuild kits and had them installed by a boat guy. Figured this was better in case the issue want just refreshing the carbs. During the carb rebuild he noted the brass line from the carb bowl was almost completely...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Will do, I just order this kit https://www.amazon.com/dp/B000XBKNCQ?psc=1&smid=ATVPDKIKX0DER&ref_=chk_typ_imgToDp I also added a fuel pump because why not. I will pull off all the fuel hoses this week and get new ones, doesn't seem like there any hose sets to buy. Thank you all for all the...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Sorry tphoyt, didn't see your post until after I checked it. Yes it has spark on both cylinders, it will spark at 3/8". I will also spray some WD in there. Could we assume with strong spark and a clean spark plug maybe its not getting fuel to that cylinder? I am going to get new wires...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Not sure what your problem is but I’m not making you read this am I? yes, thank you for post #2 like I said earlier, advice followed. Spark check, it is sparking although it’s more of a red spark than blue. compression check, yes 130+
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    These were brand new before our fishing trip today. The top one definitely has some oil on it or fouling. The bottom one doesn’t even look used.
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Yeah I would say its in amazing shape on the outside. Unfortunately for me we did not get a full test drive just a quick startup and run with muffs on. Being it popped right off I had no reason to think the top end wasn't there. I just downloaded a manual so I am combing through that now. I...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Racerone, don’t get me wrong here I have initiative and would prefer to fix on my own however after looking through the whole internet plenty of people seem to have the same problem but never post back what they did to fix it. I love forums but find that common among those who ask for help. I...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Well went to the lake again. Boat cruises at 7 mph according to my phone gps. Fresh gas and new plugs were the only changes. I took the cowling off and used the throttle myself. Anything beyond the wot stop just makes it bog down. It did idle slightly better I think but still won’t let me go...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    I also have yet to find a fuel filter. Any ideas?
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    I did not check it, I assume its in there but don't want to take off the flywheel to check. I would know right away if that was the issue wouldn't I?
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Rented a compression tester, got just over 130 on the top about 135 on the bottom. Bought a spark tester, seems to light it up pretty good. Also provides a damn good zap if you hold the coil side of the wire lol. Can someone confirm the correct plugs? In it now are QL78C. I read somewhere...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    I will test compression and find an open air spark tester. He said the gas was fresh, I will dump it an mix fresh ethanol free gas @ 50:1. I just bought evinrude XD30 oil so that should be good. Thank you all for the recommendations, anything mechanical has never really bothered me but...
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    The guy I bought it from said he just checked the compression at 140. I think it runs to smooth to not be running on both cylinders but I could be wrong.
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    84 Johnson 40 HP Weak Top End/No Slow Idle

    Hey all just picked up my first boat a 1985 16 foot Mirrocraft lake fisherman II 76" beam I think with an 84 Johnson 40 HP tiller all in amazing shape. Took it out on the lake today to get a feel for it with my family of 5. Im guessing we weigh in at 850, we had no gear today. The motor starts...
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