Search results

  1. B

    1974 Johnson 70hp "looper" plugs

    I have 70hp 1974 Johnson. The local shops i have called have all given me different recomendations on what the best spark plug is for my motor. The last time this happened they gave me a set of plugs that killed the power pack on my 6 hp. What plugs are you running (if you have this year/hp)...
  2. B

    70hp 1974 won't run at 15-25%. what can it be?

    70hp 1974 Johnson. 17' aluminum fishing boat. I try to troll for tuna and cant. The motor will troll fine at just above an idle (6 mph), try to tap it up to 8 and it will run up to 12mph and settle. Try to come down and it drops back to 6 mph. When I move the throttle from idle to and stop...
  3. B

    How to adjust low speed running

    I have a 17' aluminum fishing boat with a 1974 70 hp looper. WOT the boat runs 32 mph, at idle it run 4-5. When I try to troll at 8mph it wont, either it will climb to 10mph or it will drop to 5 mph. I can’t get it to go 8mph. Would dropping from a 17 pitch to a 15 help this? I don’t mind...
  4. B

    17' bait tank

    Decided not to fish and just take the wife and kid out for a day of tubing and knee boarding. So i pulled out the extra battery thinking no leaks so no need for extra battery. Dropped the boat in, ran for about 10 minute to the ski zone. Shut the motor down and notices a very very strange...
  5. B

    Hydrofoils on a 1974 70hp on 17' aluminum

    I am running a 70hp on a 17' aluminum. It set up for fishing (2 batteries, 25 gallon bait tank, 24 gal fuel tank. heres my question. I can currently hit 32 mph (14X17 prop) i want to be able to get up on plane and run at about 18 mph. will a hydrofoil/dolphin fin what ever there called help...
  6. B

    Can you flip the axle?

    Not sure how to describe but my trailer axle has the ends turned down so the actual axle is lower then the wheel center. Can this be turned "up" to raise the trailer? Or will they just twist and rotate back down? I got a new truck and it too high. It drags the back of the trailer over bumps.
  7. B

    suzuki and proper prop

    22' center console fiberglass. Brand new Suzuki 125 4 stroke and a 14X19 prop. WOT is only 3100 rpms and 10 mph. I was told it was just prop. if so and you follow the 200 rpm for 1 pitch ratio then he needs to go to a 14X8 pitch or so? sounds all wrong to me. I told him to double check...
  8. B

    Is 4 month old gas to old to run in a new 4 stroke?

    My buddy’s outboard blew up 4 months ago and he just had a new 4 stroke outboard put on. Is the gas in his tank to old to use? It was empty and refueled the day it blew so it's exactly 4 months and 2 days old. It’s not mixed it straight fuel. Would you run it or drain? If he drains it my old...
  9. B

    best way to remove paint off of aluminum boat

    I picked up a 17' Lund w/70hp Johnson. With help from this boat I have gotten the bugs out of the motor and she runs great but now I have noticed the paint peeling off the boat. I don’t like the paint to start with and was wondering what the best way to remove it was. If you have done this...
  10. B

    70hp 70Johnson lower unit . Thanks for all the help

    I had the 70hp Johnson which was making "milkshakes" in the lower unit. I posted some questions got some practical info. To make a long story short I couldn’t find the prop shaft seal removal tool so I drilled small holes in it, used a small screw and attached it to my dent puller. With some...
  11. B

    Not all seals are created equal (old vs new)

    I pulled the oil/prop seals out of the lower unit on my 74 Johnson 70hp last night. Made of brass, stainless springs and rubber. Very tuff stuff. I when i pulled the new replacement seals out of the package i almost fell over. they are pressed metal with rubber. they just look like they...
  12. B

    1974 Johnson 70 gear case housing puller

    I am trying to replace all the seals in my lower unit to stop the milkshake effect I am getting. I was surprised to find that my wheel puller and all that NAPA had to offer would not work to pull the "shaft bushing housing” you know, the casting behind the prop. Is there a part number for the...
  13. B

    70hp 75 Johsson lower unit bearing/shaft housing

    I have a 1974 70hp Johnson. I am going to replace the seas in the lower unit. I found out my wheel puller I was going to use to pull the "shaft housing" out with will not fit. The hole is too small and won’t go over the prop shaft. Is there a special tool for this? Any info is...
  14. B

    1974 70Hp Johnson milkshake maker. shaft seal question

    I am going to be replacing some seals in the lower unit and from looking at my manual I can’t tell if the "oil seal" that is underneath the impeller floor plate go's in from the top or bottom. Anyone have any info on this? Thank you in advance and have a safe and fun weekend! :cool: <br />Scott
  15. B

    Best cleaner for lower unit?

    What is the best cleaner to put in a lower unit to clean out all of the "milkshake" from a leak that allowed the grease/water mix to happen? I have replaced the vent/fill hole washers and want to test it (according to a great post I was turned on to on this board THANKS!!)<br />It is still on...
  16. B

    Oh boy, milkshake in lower unit. 74- 70hp Johnson

    I was doing some some last minute check getting the boat ready fror some fishing. I decided to check the lower unit oil, much to my :( suprise it was a milk shake. it's a 1974 70hp Johnson. How hard is it to replace the seals in the lower unit. i have done head hasket, impeller...
  17. B

    No fuel issue that could save your day!! 70hp Johnson

    Took the boat out 17' aluminum w/70hp Johnson (both 74 models). Fired the boat right up and backed off the trailer, pulled it to the dock to let it warm up and parked the truck. Got back it was not running. Pulled the choke it fired up then died. Did this three times and then stopped starting...
  18. B

    how much is too much . 70hp 74 Johnson

    I have a 17' aluminum v-bottom, a 1974 70hp Johnson. Load = 2 batteries, 12 gals fuel, bait tank, tackle and 2 people. At WOT back off about 20% and run for 1 hour. It will suck a 6 gal dry. Is this normal? I have run a 14 pitch (25 mph) and a 17 (34 mph :D ) it didn’t make any diff...
  19. B

    74 70hp Johnson. Must choke it!

    Hi all, I have a 74 70hp Johnson. I have done a bit of work on it with your assistance and it is running better then ever (have only had it 1 month but it didn’t run when I got it) anyway, here is my question. To start it I must pull the choke out each time. If it is running and you turn it...
  20. B

    74 70hp Johnson. Must choke it!

    Hi all,
Top