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  1. J

    Morse 305013 equivalent

    Anyone have a cross reference number for the morse 305013? It is for the rack system and appears to be pretty old. Not wanting to replace the whole helm, as it appears to have had the dash built around it. I have a spare set of cables, but the metal bracket is smaller than the helm. Another...
  2. J

    heads/compression questions

    hey guys, i have a 1989 110 hp on my bench with the low compression bath tub heads, and run approx 105 - 110 psi. is there any reason that omc went to the lower compression after rerating the 140s down to 110? just for giggles i slapped on a set of 90 hp heads that were stock from the same year...
  3. J

    115/80 johnson jet losing rpm

    backstory - new fuel lines, carbs cleaned. first run of the day it ran good. 5500 rpm constantly. fished an hour, hammered down again, shot up to 5500, then slowly fell back to 5300 with quiet, fast exhaust pops. occasionally you could hear it cut out to 5100 then pick back up. went home...
  4. J

    what could cause this issue?

    backstory - started off with a 1994 omc 90/65 jet. an older friend that fishes in the area asked me to help him out with an engine issue. he had his motor rebuilt and it lasted a year and the same exact issue happened again. the two starboard side pistons had issues where the rings wallowed out...
  5. J

    crank rated 115s vs prop rated 90s

    hey guys, general question - are the crank rated early 80s 115s comparable to the prop rated 90s of the post 85 motors? I see the prop rated 115s get the bubble back and the 90s stayed the flat back. Looking at possibly picking up a third powerhead (im stocking up, they are getting hard to find...
  6. J

    mercury 100 hp reliability.

    hey guys, looking for a 90 - 115 to turn into a jet drive. Ive only owned one merc (25 hp), and im mostly an OMC guy. I have found a 1990 mercury 100 hp, and am considering getting it and buying a jet unit for it. My boat currently has a 70 jet, and its just not enough. Is the 100 2 +2 a...
  7. J

    Plug check...

    Running a 1984 70 hp johnson jet with a 75 hp head and carburetors. This is pulling the killswitch while running wot. The 70 calls for 52d jets, while the 75 calls for 56d. Is these plugs running rich, or good enough? Should i drop down a jet or two?
  8. J

    1983 Johnson 70 horsepower timing

    Hey guys I have a 1983 70 horsepower Johnson powerhead. I am getting it running as a spare. According to my manual the timing should be set according to the sticker on the motor. My motor does not have a sticker. My 1984 75 horsepower says 19 degrees. Is that the same for the 70? Does anyone...
  9. J

    wsm pistons

    anyone have experience with them? Ive found a spare block and would like to rebuild it to keep as a bolt on spare for my guiding business. The motor is an early 80s johnson 75 hp. Ive found two OEM pistons, but havent been able to locate a third new one. The WSM are readily available. anyone...
  10. J

    A new issue with my 1984 johnson 75.

    Took the boat out Sunday, and it ran great. However, I noticed My tach wasnt working, nor was my battery voltage coming up any. I ordered a new rectifier from iboats. Installed the new rectifier tonight, and plugged my tach back into the control box. I noticed I had no power to the gauge...
  11. J

    1984 johnson 75 hp compression

    Hey guys, just picked up a cheap 1984 johnson 75/40 jet off of a totaled boat. Motor starts and idles well in the test tank. Definitely running on all 3 cylinders, as tested by removing plug wires one at a time while running. My question, is that the compression is 140, 135, 115. Removing...
  12. J

    anyone experience this weird control box issue?

    1994 johnson 50/35 jet. (J50JERE) 2003 tracker grizzly boat. Its set up as a stick steer, with aluminum brackets connected directly to the hull to serve as a control box/steering mounts. I've noticed that ever since I've used this set up, the control box seemingly likes to ground itself off...
  13. J

    1984 johnson 75 hp no crank

    j75ecrd j5949958 rebuilt the engine, and starting breaking it in and the compression evened out pretty well. I left for 4 days for a bear hunting trip, and came back and am having a no crank condition. wire directly from battery to starter works fine. getting 12.7v to the hot wire on the...
  14. J

    1984 johnson 75 rebuild questions

    j75ecrd j5949958 i tore down this 1984 johnson 75 that came with a boat i bought to use with another motor. I figured out the bottom carb was clogged and broke the rings off of the bottom piston, presumably at the ports, due to the lack of cylinder wall damage. it had 145 psi on top 2, 0 on...
  15. J

    1984 johnson 75 hp loss of compression

    J75ECRD got this motor with a boat i bought to use with my current motor.. its a 75/50 1984 3 cylinder johnson jet. top two cylinders are 135 psi, bottom is 30 psi. pulled the head and discovered this. The bore looks surprisingly good. I havent torn it down yet (will happen this winter...
  16. J

    2001 johnson 35 hp 3 cylinder fuel issues

    hi guys, have a 2001 3 cylinder 35 hp johnson. oil mixer removed, fuel line run directly from second fuel pump to fuel filter to carbs. The past two times out, ive noticed that I lose fuel after running a mile or two. motor bogs and then dies. However, it picks up back and continues running for...
  17. J

    1994 johnson 50/35 jet no spark

    no spark on either cylinder - here is what i tested so far. removed killswitch wire with no gain in spark. brown and brown/yellow wire together produced 155 - 160volts. orange and orange black wires - powerpack hooked up 5.5v. powerpack unhooked and meter hooked up to stator plug - 80v...
  18. J

    trailer project (bunk guide ons and tongue extension)

    3/8" flat bar, bent by hand in a vise with some heat added. 2 x 4, carpet, couple of u bolts and bolts for the 2 x 4. drill the bolt head side of the 2 x 4 3/8" and pounded the head in it so it wouldnt come out and scratch boat. total cost was about $30 detailed instructions: i cut 3/8" flat...
  19. J

    adding length to trailer tongue

    got a buddy whos boat trailer is about 18" too short for his jon boat. the tongue is made of 3 x 3 tube. i suggested maybe he should look into a fold away kit and just put the winch stand and jack between the coupler and the joint and leave it permanently locked - the kit is $70, plus $15 for a...
  20. J

    1998 35 hp 3 cylinder johnson mounting bracket question

    hey guys, got the motor running great, and decided to convert to short shaft because i didnt like the way the vertical extension torque'd on the transom. ive run into a problem. I need to drop the motor another hole, but the bottom holes werent drilled to line up with the top, presumably because...
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