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    TACHOMETER ACCURACY

    I have a 1978 Johnson 115hp V4 crossflow. I'm having issues with my Tachometer. It seems to be accurate up to around 2000 rpm. But, when I push the throttle down tach climbs to around 7200rpms, and I'm not even at WOT yet! I think WOT should be around 5200 on my motor. Obviously, my tachometer...
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    78 JOHNSON 115 TACHOMETER PROBLEMS

    I'm not sure if this is the right forum to post this so let me know if it is not. I have a, relatively new, tachometer gauge mounted in the dashboard of my 82 Ranger that is doing some very strange things: when I turn the key on at the motor's remote control the needle on the tach will climb...
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    78 Johnson 115 intake manifold

    Hello, I am rebuilding the carbs on my 115hp. After pulling both carbs and peeling off the gaskets, I noticed a "chip" in the intake manifold where the lower carb mates to it. See pic. Is this something that I should be concerned with? TIA, Bryan
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    78 Johnson 115 starboard cylinder head getting hot

    Hello, getting ready for summer. Ran motor on muffs. steady stream coming from telltale. Then stream started spitting (not steady). IR thermometer showed 118F port side cylinder head and and 152F on starboard cylinder head. No change in RPM's or engine sound, although, it was idling a bit high...
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    TRIM/TILT ELECTRICAL CONVERSION

    Hello, I have a 1978 Johnson 115hp Crossflow V4. It has a power trim/tilt with the older solenoid wiring setup. I also have a 1982 Evinrude 115hp Crossflow V4 that I have been using for parts. It has a power trim/tilt with the relay wiring setup. It works much better than the one on the Johnson...
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    NEED PROP ADVICE: '78 Johnson115 2stroke/ '82 Ranger 330V

    Hello, I want to upgrade to a stainless prop. Currently running a stock aluminum 13 x 19. Hole shot is decent, but I suspect that might be from the hydrofoil (on it when I bought it). I run 42mph at 5200 rpm, with a little bit of throttle left to hit WOT. Not sure what my max rpm's are. I'm...
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    Deep Cycle Battery not good for starting??

    Hi, I have a 1978 Johnson 115 on my 82 Ranger 130V. I currently have two Group 27 deep cycle marine batteries powering my trolling motor. And I have one Group 27 Deep cycle marine for my starting/house/electronics. Is this a good configuration? Lithiums are not in the budget right now. Also my...
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    78 Johnson 115 Overcharging??

    Took the (bass) boat out yesterday and motor was running good. The voltmeter was reading between 13-14.9V for most of the day. I never opened her up to WOT and cruised at about 4500-5000 rpm. Then on my way in the voltmeter was reading a steady 16.7V and even went all the way to 17V for about 30...
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    78 Johnson 115 Running Great! But Bow of Boat is "Plowing"?

    Hello, maybe this is the wrong section to post this, but I have received so much good advice here: I took my 82 Ranger 130V w/ 78 Jonson 115hp out on the water yesterday. The motor ran excellent, thanks to the help I've received here! When up on plane, the bow of my boat is slightly pointed...
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    Older boat/ motor and New Electronics

    I have a 78 Johnson 115 V4 on the back of my 82 Ranger 330V. I have put much (probably too much) time and money into both of them. Both boat and motor perform well. The bought came to me with a Humminbird Helix 9 at the bow, and I have added a garmin Echomap 9 with side and downscan. Both are...
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    Charging trolling motor batteries

    Hello. I usually hang out in the Johnson/Evinrude section, but I have some questions about batteries. I am currently running a 12V Minn Kota Edge powered by two 12V flooded lead acid batteries, wired in parallel, for longer run time. To charge them, I have been using a basic, but newer digital...
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    78 Johnson 115hp Crossflow Stalls When Put into Gear!?!

    Hello. Can anyone tell me how to properly adjust the remote control cables where they connect to the motor. I think that my motor is stalling because they are not adjusted correctly. I recently rebuilt my carbs and replaced fuel pump. When I put the carbs back on I followed the factory service...
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    V4 CROSSFLOW: SPRING MAGNET IN LOWER UNIT??

    Hello. I am replacing the seals in the lower unit of my 1978 Johnson 115hp. My question is about the football shaped magnet spring. When I unscrewed the shift rod and pulled it out I heard something in the gearbox and when I took off the cover I retrieved the spring magnet. Does that thing just...
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    Johnson V4 Crossflow Throttle return

    Hello. On my 1978 Johnson the throttle doesn't seem to be returning properly. At first, I thought it was the timer base. Is the throttle supposed to return to the idle stop screw and the timer base back to its starting point? No difference if the cable is off or on hopefully I'm explaining this...
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    What kind of lube for timer base??

    Hello, I am replacing ignition components on my 1978 Johnson 115 V4 Crossflow. My old timer always seem to have problems returning back to idle. Some suggested that may have been because the grease dried up. The old one was brass, but the new one is all plastic. What type of lubricant should I use??
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    ELECTRICAL CONNECTOR TOOLS

    Hello, I'm replacing some parts on my '78 Johnson 115 and need to remove a couple of wires from their Amphenol connectors. Then I will need to insert each of the two wires into the two new connectors. Does anyone know of a way to do accomplish this WITHOUT buying the tool kit that is kind of...
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    Carburetor Rebuild Question....V4 Crossflow

    Hello, I'm all set to rebuild the carburetors on my '78 Johnson 115hp. The factory service manual says to "put a bead of OMC adhesive 'M' around the outer edge of new core plug". I was taught to NEVER use adhesives or sealants in carburetors! Does anyone have any experience with " adhesive M"...
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    CROSSFLOW PERFORMANCE ?'s

    Hello, I have a 1978 Johnson 115hp V4 on my '82 Ranger bass boat. This morning after fishing I decided to fool around a bit. I've spent the last two years restoring this boat & motor and I wanted to see how it handled, top speed, etc. I always run it WOT from one fishing spot to the next, but...
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    78 TO 82 115HP CARBURETOR SWAP??

    Will the carbs off of a 1982 Evinrude 115 work on a 1978 Johnson 115?
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    78 Johnson 115 Carb Kit??

    Hello, I'm looking for a carb kit for my 115ETL78C. The info on my usual parts websites is conflicting. crowleymarine doesn't recognize 115ETL78C, but gives me 115ETZ78C, for which the carb kit is p/n 0439076. They are a bit pricey so I went to wholesalemarine to look for a Sierra kit. They give...
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