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  1. marcusknight

    1979 70HP Johnson bogged down after using Seafoam...

    I have a hunch this has happened to many other people. I was trying to improve my performance by running the specified amount of Seafoam through the fuel system. I added the appropriate amount of fuel, oil, and seafoam to the fuel tank and ran through a full tank. Not much time later, on a...
  2. marcusknight

    iNavx GPS for iphone ipad

    Has anyone had experience using the iNavx software for Ipad or Iphone? How well does it work compared to fancy GPS systems you can install on your boat? Marcus www.inavx.com
  3. marcusknight

    Marine Radio. Dash mounted versus Portable

    I am looking to get a marine radio to go with my 1979 16 foot StarCraft. I spend time on the Bay of Green Bay and occasionally Lake Michigan. Trying to decide if I should get a dash mounted or portable. I like dash mounted because of the much better range you can get for reception with a...
  4. marcusknight

    1979 Johnson 70 horse engine with idle problems

    I have a 1979 Johnson outboard engine and it's had some problems stalling out at idle speed. It's been hard to determine what it is but someone today at a shop suggested that it could have something to do with the fuel delivery including perhaps some sort of gasket or some type of ring just...
  5. marcusknight

    1980s Bayliner Volvo vs Ford Inboard Engines

    I may have an opportunity to buy one of two 1980s 18 foot Bayliner Capri. One has a Volvo engine and the other newer one has a Ford. Assuming the conditions of the boats were about the same, was one of these engines better than the other?
  6. marcusknight

    Outboard Engine turns from side to side while trailering

    Ever since I bought my boat, my 1979 Johnson turns from side to side while trailering. I find I have to do what the previous owner did and latch the steering wheel with a bungee cord. Is there a better way to manage this?
  7. marcusknight

    70 horse Johnson stalling, spark plug question

    I have a 1979 Johnson 70 horse. When I bought it I replaced the spark plugs with Auto Lite 2634 plugs. They worked quite well. I recently replaced them again with Champion Plugs this time. QL77JC4 which is supposed to suppress RF interference. There is also some dispute as to what gap to...
  8. marcusknight

    15 volts charging from a 1979 70 HP Johnson. Abnormal?

    I have this engine and when I first start it, it puts out about 13 volts but it gradually creeps its way up to 15 or more volts after a few minutes. Is this abnormal? I am using the same 24 series deep cycle battery I have been using since 2007 and I recently noticed some faint hissing from...
  9. marcusknight

    Propeller on 1979 16ft StarCraft with 70 HP Johnson

    I finally hooked my tach up to my 70 Johnson because I was eager to learn what the RPMs are with a 14 diameter 17 pitch propeller that is on my engine. It came with it and I am surprised it fits given I hear lots about people using 13.75 props for this engine. Anyway, the idle speed in...
  10. marcusknight

    Need some 1979 Starcraft advice, watch my video please!

    I have a 1979 16 foot Starcraft with a 70 horse Johnson. I am doing some maintenance and some upgrading and could use some advice from other people that have had similar boats and engines. Please watch my video which will give you an overview of my boat and some of the various issues I have...
  11. marcusknight

    Tubing with 16 foot starcraft

    Over the weekend I took my boat out and tried to go tubing the first time. When I was towing the tube, I found that my engine did not seem to get above 7 miles an hour or so. It normally can go up to 30. It was a one person tube with one person on it. It felt like my 70 horse Johnson was...
  12. marcusknight

    Starting Issue on Johnson 1979 Seahorse 70hp, Lockup

    Occasionally when I try to start my Johnson seahorse, I will turn the key and I hear a click and nothing happens, no turn over. Battery is charged and no issue there. The way I able to fix this is I have to use the emergency manual start cord around the fly wheel and all I have to do is pull...
  13. marcusknight

    Wiring Harness for 1979 Johnson 70HP Tachometer

    I just got myself a Tachometer for my 1979 Johnson 70hp. In the control unit near the driver, just below the key is a dust cover and under it is a female 3- pin connector. Does anyone know where I can get a wiring harness to go between this connector and the tachometer? Or is this going to be...
  14. marcusknight

    1979 70hp Johnson stalling

    I have a 1979 70hp Johnson and I am curious if this is supposed to happen. My engine runs and operates well but more often than not when I start it (especially when its warm), it will run for a few seconds and then quit. In order to avoid this, I have to use the neutral throttle lever to give...
  15. marcusknight

    Bimini Top for 1979 Starcraft 16 feet

    Summertime is approaching and I am again considering a Bimini Top for my boat. I have the average 1979 16 foot StarCraft. I could really use some more people to weigh on a couple pieces of information. For starters, for those of you who have this exact boat and have installed a Bimini...
  16. marcusknight

    GPS Recommendations for 16 foot starcraft

    Does anyone have a recommendation for a GPS / Fishfinder for not a outrageous price? I am looking for something that would show me where I am on a map and also show me on the map the depths around me and any obstacles buoys etc.
  17. marcusknight

    What type of ladder works best for 1970s Starcraft SuperSport

    I have a 1970s Starcraft SuperSport. I have been using one of those white ladders with the hooks on top. I find the thing flimsy and awkward to get back into the boat with it. Does anyone have any experience with ladders? What would work best for this type of boat?
  18. marcusknight

    1979 Johnson 70 HP Sea Horse on 79 Starcraft SS 16 ft

    I have a 1979 Johnson 70 HP Sea Horse on 79 Starcraft SS 16 ft. I know very little about propellers and I could use a prop recommendation. Right now the boat goes about 30 mph on a good day. I don't have access to the boat right now but I am looking at the spare prop sitting on my desk...
  19. marcusknight

    1979 StarCraft with a small area of transom rot

    Re: 1979 StarCraft with a small area of transom rot More Pics
  20. marcusknight

    1979 StarCraft with a small area of transom rot

    Re: 1979 StarCraft with a small area of transom rot Here are some more pictures.
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