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    1977 70HP - Dies when going from stop to WOT

    I have a 70HP 1977 Johnson. I recently cleaned out the carbs and de-carbed the engine. Took her out and did a couple of runs with no problem. Suddenly between moving from spot to spot the engine dies. Turns on no problem. I set it in gear and give it a little gas and then push it to WOT...
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    what size starting prop?

    I've got 70 hp 1977 Johnson, model 70EL77S, on an old 1977 VIP tri-hull ski boat. Its 16 feet long by about 6 feet wide. What whould be the ideal prop for this guy? -thanks!
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    Battery Advice

    Johnson Outboard 1977 - 70HP Model: 70EL77S What battery do you guys recommend for this engine? Can I run it with any car battery? I have in the past with no problems but now I need a new battery. I have a spare car battery laying around but am unsure if the amperage is too high. These...
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    bad starter solenoid ??

    HP: 70hp MODEL:70EL77S I tried starting up the boat yesterday with no luck. It has worked great in the past but it has been sitting for a couple of months. The solenoid clicks but the starter does not turn. I have 12.9 volts at the incoming connection at the solenoid form the battery. When...
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    throttle lever stuck (in the command center)

    Johnson 70EL77S 70HP I am having a problem with the main throttle lever. When I move the lever forward to the WOT position and then want to come back to neutral, the two teeth that enguage the transmission cable linkage come out of their slots. I then have to open up the command center...
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    Will Gas Prices Park Your Boat?

    Hello. I'm just wondering if high gas prices will stop or reduce your boating. I live 30 miles from the Lower Laguna Madre in South Texas and I am debaing if I should take the boat out on a fishing trip. My Silverado will use up 1/2 a tank to take me to and from the boat ramp. Thats almost a...
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    70 hp boggs down when gunning the throttle

    Hello, I've got a Johnson 70 hp, 1977. I brought her back to life last year. I did a carb rebuild, replaced fuel lines, water pump replacement, thermostat replacement, sea foam decarb process...... When first started up, I let my engine warm up a little before I open her up all the way. She...
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    70 hp Johnson decarb

    70EL77S I preformed a decarb to my motor yesterday, Sat Nov 20. I followed the decarb procedure on the sticky thread but was not able to take it out on the water to run it at full throttle. I did everything else with the muffs on. I wanted to take her out today to completely finish the...
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    Large or Small Gear Case; Johnson 70HP?

    I've have a 1977 Johnson 70 HP motor. 70EL77S I am trying to find a replacement for my prop. I was looking at getting a stilleto prop, 17" pitch. On this website there are two options for my engine, a small gear case or a large gear case. I know my prop is a 13 tooth spline but don't know...
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    trailer paint

    I just lifted my boat off the trailer and want to pait the trailer. It is rusted all over and I don't know exacly how to remove the rust before I pait other than sanding it down. Is there another way or other tools that can help me remove the rust quicker. I also have the corroseal liquid but...
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    Can my boat handle the ocean?

    Does anyone do any Texas Gulf Fishing? I live in deep south Texas and have only done bay fishing. I do most of my fishing on the lower laguna madre, in between Port Isabel and South Padre Island. I've gone out for trout and reds in the bay for a little while on both my boat and kayak. Now...
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    Hurricane Boat Storage

    Hey guys. I'm a fairly new boat owner and haven't had to deal with a hurricane with a boat in my drive way before. What kind of storage should I keep it in? How can I anchor it? TS Alex is projected to become a hurricane and hit the TX coast and I live right on the southern tip of TX...
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    Throttle Control Advise

    Hey guys, I tryed to pull my brother for the first time on my boat. It has a 70hp 1977 Johnson which I just recently tuned up from water pump to carburators. It runs great. I've got a used 13.5" x 17" stilleto s/s prop. It takes a little while to get him up, but once he is up the boat takes...
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    tach installation

    How do you install and where do you buy tach for my engine? 70HP Johnson 70EL77S Thanks for your help.
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    hydrofin above prop

    I know this is not really a prop question but I hope you guys can help me out. I just restored and old ski boat, it doesn't have one of those hydofins. When I go on WOT the boat takes a while to plane out and it runs very inclined. 1. Will one of these level the boat out? 2. Will it improve...
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    too much oil in gas mixture

    what happens if there is too much oil in the gas mixture. what problems will that cause? would that excess oil make it difficult to start my motor?
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    new to boating - how do you use a maual tilt

    I am new to boating. I have a '77 16ft vip. It has an outboard engine and the tilt is manual. You have to lift the motor, remove the bottom locking pin and insert in a new position to change the engine angle. How do you use the trim? When do you need it tilted forward or back?
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    spark plug advise

    I have a 70EL77S Johnson outboard. What brand sprak plug do you guys recomend? I have the model type on a sticker on the engine but do not know the gap it should have. Please advise
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    idle adjustment question

    i finally completed all the maintenance items to the engine.. turned it on with the key and she started right up with no problems. but when it did start, the idle speed was way too high. after staring at the levers and screws, i decided to turn the black knob (#1). after that the idle went...
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    water pump impeller oversized?

    i have a johnson 70hp, 1977. 70EL77S i am replacing the water pump housing, impeller, the whole enchilada. but i came across a huge issue. i am not to familiar with boats, everything i am doing is based on threads i have seen here and instructional videos. the impeller does not fit the...
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